Abstract
In this paper, we establish sufficient conditions for exact null controllability of Sobolev type stochastic differential equations with fractional Brownian motion and Poisson jumps in Hilbert spaces, where the time fractional derivative is the Hilfer derivative. The exact null controllability result is derived by using fractional calculus, compact semigroup, fixed point theorem and stochastic analysis. Finally, an example is given to show the application of our results.
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1 Introduction
The noises THAT arise in mathematical finance, physics, telecommunication networks, hydrology and medicine etc., can be modeled by fractional Brownian motions (see [1,2,3]). Recently, fractional differential equations and stochastic fractional differential equations driven by fractional Brownian motion have been considered greatly by the research community in various aspects due to its salient features for real-world problems (see [4,5,6,7,8,9,10,11,12,13,14,15]). In addition, controllability problems for different kinds of dynamical systems have been studied by several authors (see [16,17,18,19,20,21,22,23,24,25]), and references therein. Moreover, Hilfer proposed a generalized Riemann–Liouville fractional derivative for short, Hilfer fractional derivative, which includes Riemann–Liouville fractional derivative and Caputo fractional derivative (see [26, 27]). Subsequently, many authors studied the existence of solutions and controllability for fractional differential equations involving Hilfer fractional derivatives (see [28,29,30,31]). Few authors have studied the stochastic fractional differential equations with Poisson jumps (see [32,33,34,35]). On the other hand, the Sobolev-type (fractional) equation appears in a variety of physical problems such as flow of fluid through fissured rocks, thermodynamics, propagation of long waves of small amplitude and shear in second-order fluids and so on. There are many interesting results on the existence and uniqueness of mild solutions and approximate controllability for a class of Sobolev-type fractional evolution equations. Revathi et al (see [36]) studied the local existence of mild solution for a class of stochastic functional differential equations of Sobolev type with infinite delay. Benchaabanea and Sakthivel (see [37]) investigated the existence and uniqueness of mild solutions for a class of nonlinear fractional Sobolev-type stochastic differential equations in Hilbert spaces with non-Lipschitz coefficients. Sakthivel et al (see [38]) investigated the approximate controllability of fractional stochastic differential inclusions with nonlocal conditions. However, no work has been reported in the literature regarding the null controllability of Sobolev-type Hilfer fractional stochastic differential equations with fractional Brownian motion and Poisson jumps. Motivated by these facts, the purpose of this paper is to investigate the exact null controllability of Sobolev-type stochastic differential equations with fractional Brownian motion and Poisson jumps in Hilbert spaces, where the time fractional derivative is the Hilfer derivative, of the form
where \( D^{\nu ,\mu }_{0+}\) is the Hilfer fractional derivative, \(0 \le \nu \le 1,~ \frac{1}{2}< \mu < 1,\) \(x(\cdot )\) takes values in a Hilbert space X with inner product \(\langle \cdot , \cdot \rangle \) and norm \(\Vert \cdot \Vert \) and \(B^H\) is a fractional Brownian motion (fBm) on a real and separable Hilbert space Y with Hurst parameter \(H \in (\frac{1}{2},1)\). The symbol A and G are linear operators on X. The control function \(u(\cdot )\) is given in \(L_2(J, U)\), and the Hilbert space of admissible control functions with U as a separable Hilbert space. The symbol B stands for a bounded linear operator from U into X. The mappings \(F: J \times X \rightarrow X,\) \(h: J \times X \times Z \rightarrow X\) and \(\sigma : J \times X \rightarrow L_2^0(Y,X)\) are nonlinear functions.
The rest of the paper is organized as follows. In Sect. 2, we collect some notations, definitions and lemmas of fractional operators, fractional Brownian motion, stochastic analysis and exact null controllability. In Sect. 3, we study the exact null controllability of the system (1). We present an example to illustrate the theoretical result in the final section.
2 Preliminaries
To study the null controllability of Sobolev-type stochastic Hilfer fractional differential equations with fractional Brownian motion and Poisson jumps, we need the following basic definitions and lemmas.
Definition 2.1
(see [39, 40]) The fractional integral operator of order \(\mu > 0 \) for a function f can be defined as \( I^\mu f(t)=\frac{1}{\Gamma (\mu )}\int ^t_0 \frac{f(s)}{(t-s)^{1-\mu }} \mathrm{d}s,~~ t > 0, \) where \(\Gamma (\cdot )\) is the Gamma function.
Definition 2.2
(see [26]) The Hilfer fractional derivative of order \(0\le \nu \le 1 \) and \(0< \mu < 1\) is defined as \( D^{\nu ,\mu }_{0+} f(t)= I^{\nu (1-\mu )}_{0+} \frac{d}{\mathrm{d}t}I^{(1-\nu )(1-\mu )}_{0+} f(t). \)
Fix a time interval [0, b] and let \((\Omega ,\eta ,P)\) be a complete probability space furnished with complete family of right continuous increasing sub-\(\sigma \)-algebras \(\{\eta _t:t\in [0,b]\}\) satisfying \(\eta _t\subset \eta \). Let \((Z,\Psi ,\lambda (\mathrm{d}z))\) be a \(\sigma \)-finite measurable space. We are given stationary Poisson point process \((p_t)_{t \ge 0},\) which is defined on \((\Omega ,\eta ,P)\) with values in Z and with characteristic measure \(\lambda .\) We will denote by \(N(t,\mathrm{d}z)\) the counting measure of \(p_t\) such that \(\tilde{N}(t,\Theta ):= E(N(t,\Theta ))=t\lambda (\Theta )\) for \(\Theta \in \Psi \). Define \(\tilde{N}(t,\mathrm{d}z):= N(t,\mathrm{d}z)-t\lambda (\mathrm{d}z)\), the Poisson martingale measure generated by \(p_t\).
Suppose that \(\{\beta ^H( t),t \in [0,b]\}\) is the one-dimensional fractional Brownian motion with Hurst parameter \(H\in (1/2,1)\). That is, \(\beta ^H\) is a centered Gaussian process with covariance function \(R_H(s,t)=\frac{1}{2}(t^{2H}+s^{2H}-|t-s|^{2H})\) (see [1]). Moreover \(\beta ^H\) has the following Wiener integral representation: \( \beta ^H(t)= \int _0^t K_H (t,s) d \beta (s), \) where \(\beta = \{\beta ( t) , t \in [0, b ]\}\) is a Wiener process, and \(K_H(t,s)\) is the kernel given by \( K_H(t,s) = c_H s^{\frac{1}{2}- H} \int _s^t (u-s)^{H- \frac{3}{2}} u^{H-\frac{1}{2}} du \) for \(s<t\), where \(c_H = \sqrt{\frac{H(2H-1)}{\beta (2-2H, H - \frac{1}{2})}}\) and \(\beta (p,q) = \int _0^1 t^{p-1}(1-t)^{q-1},~p>0,~q>0.\) We put \(K_H(t,s)=0\) if \(t \le s\). We will denote by \(\zeta \) the reproducing kernel Hilbert space of the fBm. In fact, \(\zeta \) is the closure of set of indicator functions \(\{1_{[0,t]},t \in [0,b] \}\) with respect to the scalar product \(\langle 1_{[0,t]},1_{[0,s]} \rangle _\zeta =R_H(t,s)\).
The mapping \(1_{[0,t]}\rightarrow \beta ^H(t)\) can be extended to an isometry from \(\zeta \) onto the first Wiener chaos and we will denote by \(\beta ^H(\varphi )\) the image of \(\varphi \) under this isometry. We recall that for \(\psi , \varphi \in \zeta \) their scalar product in \(\zeta \) is given by
Let us consider that the operator \(K^*\) from \(\zeta \) to \(L^2([0,b])\) is defined by
Moreover for any \(\varphi \in \zeta \), we have
Let X and Y be two real, separable Hilbert spaces and let L(Y, X) be the space of bounded linear operators from Y to X. For the sake of convenience, we shall use the same notation to denote the norms in X, Y and L(Y, X). Let \(Q\in L(Y,Y)\) be an operator defined by \(Qe_n=\lambda _n e_n\) with finite trace \(trQ= \sum _{n=1}^\infty \lambda _n < \infty ,\) where \(\lambda _n\ge 0~(n=1,2,\ldots )\) are non-negative real numbers and \(\{e_n\}~(n=1,2,\ldots )\) is a complete orthonormal basis in Y.
We define the infinite dimensional fBm on Y with covariance Q as
where \(\beta _n^H\) are real, independent fBms. The Y-valued process is Gaussian, starts from 0, and has mean zero and covariance:
To define Wiener integrals with respect to Q-fBm, we introduce the space \(L^0_2:= L^0_2(Y,X)\) of all Q-Hilbert–Schmidt operators \(\psi :Y\rightarrow X\). We recall that \(\psi \in L(Y,X)\) is called a Q-Hilbert–Schmidt operator, if \(\Vert \psi \Vert ^2_{L^0_2}:=\sum _{n=1}^\infty \Vert \sqrt{\lambda }_n\psi e_n\Vert ^2 <\infty \) and that the space \(L^0_2\) equipped with the inner product \(\langle \vartheta ,\psi \rangle _{L_2^0}=\sum _{n=1}^\infty \langle \vartheta e_n,\psi e_n \rangle \) is a separable Hilbert space. Let \(\phi (s);~s\in [0,b]\) be a function with values in \(L_2^0(Y,X);\) the Wiener integral of \(\phi \) with respect to \(B^H\) is defined by
where \(\beta _n\) is the standard Brownian motion.
Lemma 2.3
(see [14, Lemma 2]) If \(\psi : [0,b]\rightarrow L^0_2(Y,X)\) satisfies \(\int _0^b \Vert \psi (s)\Vert ^2_{L^0_2 }< \infty ,\) then the above sum in (2) is well defined as X-valued random variable and we have
Let \(C(J, L_2(\Omega , X))\) be the Banach space of all continuous maps from J into \(L_2(\Omega ,X)\) satisfying the condition \(\sup _{t\in J}E\Vert x(t)\Vert ^2 \!<\!\infty \). Define \(\bar{C} \!=\!\{x:\cdot ^{(1- \nu )(1-\mu )}x(\cdot )\in C(J,L_2(\Omega ,X))\},\) with norm \(\Vert \cdot \Vert _{\bar{C}}\) defined by
Obviously, \(\bar{C}\) is a Banach space. Like [41], we denote \(\bar{C}^{\nu +\mu -\nu \mu } =\{x:x\in \bar{C}, D^{\nu +\mu -\nu \mu }_{0+}x\in \bar{C}\}\) \(\bar{C}^{\nu ,\mu } =\{x:x\in \bar{C}, D^{\nu ,\mu }_{0+}x\in \bar{C}\}\). Obviously, \(\bar{C}^{\nu +\mu -\nu \mu } \subseteq \bar{C}^{\nu ,\mu }\).
The operators \(A: D(A)\subset X\rightarrow X\) and \(G: D(G) \subset X \rightarrow X\) satisfy the following hypotheses:
-
(I)
A and G are closed linear operators.
-
(II)
\(D(G) \subset D(A)\) and G is bijective.
-
(III)
\(G^{-1}: X \rightarrow D(G)\) is continuous.
Here, (I) and (II) together with the closed graph theorem imply the boundedness of the linear operator \(AG^{-1}:X\rightarrow X\).
(IV) For each \(t\in J\) and for \(\lambda \in (\rho (AG^{-1}))\), the resolvent of \(AG^{-1}\), the resolvent \(R(\lambda , AG^{-1})\) is the compact operator.
Lemma 2.4
(see [42, Theorem 3.3]) Let T(t) be a uniformly continuous semigroup. If the resolvent set \(R(\lambda , A)\) of A is compact for every \(\lambda \in \rho (A)\), then T(t) is a compact semigroup.
From the above fact, \(AG^{-1}\) generates a compact semigroup \(\{S(t),t> 0\}\) in X, which means that there exists \(M >1\) such that \(\sup _{t\in J}\Vert S(t)\Vert \le M\).
For \(x\in X\), we define two families of operators \(\{S_{\nu ,\mu }(t):t>0\}\) and \(\{P_\mu (t):t>0\}\) by
where
is a function of Wright type which satisfies
Lemma 2.5
(see [29, Propositions 2.15,2.16,2.17]) The operator \(S_{\nu ,\mu }\) and \(P_\mu \) have the following properties:
-
(i)
\(\{ P_\mu (t): t > 0\}\) is continuous in the uniform operator topology.
-
(ii)
For any fixed \(t >0,~S_{\nu , \mu }(t)\) and \(P_\mu (t)\) are linear and bounded operators, and
$$\begin{aligned} \Vert P_\mu (t)x\Vert \le \frac{M t^{\mu -1}}{\Gamma (\mu )}\Vert x\Vert ,~~\Vert S_{\nu ,\mu }(t)x\Vert \le \frac{M t^{(\nu -1)(1-\mu )}}{\Gamma (\nu (1-\mu )+ \mu )}\Vert x\Vert . \end{aligned}$$(6) -
(iii)
\(\{P_\mu (t):t>0\}\) and \(\{S_{\nu ,\mu }(t):t >0\}\) are strongly continuous.
To study the exact null controllability of (1), we consider the fractional stochastic linear system
associated with the system (1). Consider
where \(L_0^b u\) has a bounded inverse operator \((L_0)^{-1}\) with values in \(L_2(J, U)/ker(L_0^b)\), and
Definition 2.6
(see[23, Definition 2.2 and Remark 2.3]) The system (7) is said to be exactly null controllable on J if \(Im L_0^b \supset Im N_0^b\) or there exists a \(\gamma >0\) such that \(\Vert (L_0^b)^*y \Vert ^2\ge \gamma \Vert (N_0^b)^* y\Vert ^2\) for all \(y\in X\).
By [43, Lemma 3], we have the following result.
Lemma 2.7
Suppose that the linear system (7) is exactly null controllable on J. Then the linear operator \((L_0)^{-1} N^b_0:X\times L_2(J, X)\rightarrow L_2(J,U)\) is bounded and the control
transfers the system (7) from \(y_0\) to 0, where \(L_0\) is the restriction of \(L_0^b\) to \([\ker L_0^b]^\perp \) and \(F\in L_2(J,X),\sigma \in L^0_2(J,L(Y,X))\).
3 Exact Null Controllability
In this section, we formulate sufficient conditions for exact null controllability for the system (1).
First, we give the definitions of mild solution and exact null controllability.
Definition 3.1
We say \(x\in \bar{C}\) is a mild solution to (1) if it satisfies that
Definition 3.2
The system (1) is said to be exact null controllable on the interval J if there exists a stochastic control \(u\in L_2(J,U)\) such that the solution x(t) of the system (1) satisfies \(x(b)= 0\).
To prove the main result, we need the following hypotheses:
-
(H1)
The fractional linear system (7) is exactly null controllable on J.
-
(H2)
The function \(F:J\times X\rightarrow X\) satisfies the following two conditions:
-
(i)
The function \(F:J\times X\rightarrow X\) is continuous. Assume \(F\in \bar{C}^{\mu (1-\nu )}\) for any \(x\in \bar{C}^{\mu (1-\nu )}\), which guarantees \(D^{\nu ,\mu }_{0+}x\in \bar{C}\) exists.
-
(ii)
For each positive number \(q\in N\), there is a positive function \(f_q(\cdot ):J \rightarrow R^+\) such that
$$\begin{aligned} \sup _{\Vert x\Vert ^2\le q} E\Vert F(t,x)\Vert ^2 \le f_q(t), \end{aligned}$$the function \(s\rightarrow (t -s)^{\mu -1} f_q(s) \in L^1([0,t], R^+),\) and there exists a \(\delta >0\) such that
$$\begin{aligned} \lim _{q \rightarrow \infty }\inf \frac{\int _0^t (t-s)^{\mu -1}f_q(s) \mathrm{d}s}{q}=\delta <\infty , \quad t\in J. \end{aligned}$$
-
(i)
-
(H3)
The function \(\sigma :J\times X\rightarrow L_2^0(K, X)\) satisfies the following two conditions:
-
(i)
The function \(\sigma :J\times X\rightarrow L_2^0(K, X)\) is continuous.
-
(ii)
for each positive number \(q\in N\), there is a positive function \(g_q(\cdot ):J \rightarrow R^+\) such that
$$\begin{aligned} \sup _{\Vert x\Vert ^2\le q}E\Vert \sigma (t,x)\Vert ^2_{L_2^0}\le g_q(t), \end{aligned}$$the function \(s\rightarrow (t -s)^{\mu -1}g_q(s)\in L^1([0,t], R^+)\), and there exists a \(\delta > 0\) such that
$$\begin{aligned} \lim _{q\rightarrow \infty }\inf \frac{\int _0^t (t-s)^{\mu -1}g_q(s) \mathrm{d}s}{q}=\delta <\infty , \quad t\in J. \end{aligned}$$
-
(i)
-
(H4)
The function \(h:J\times X\times Z\rightarrow X\) satisfies the following two conditions:
-
(i)
The function \(h:J\times X\times Z\rightarrow X\) is continuous.
-
(ii)
For each positive number \(q\in N\), there is a positive function \(\chi _q(\cdot ):J \rightarrow R^+\) such that
$$\begin{aligned} \sup _{\Vert x\Vert ^2 \le q}\int _Z E \Vert h(t, x,z) \Vert ^2 \lambda (\mathrm{d}z)\le \chi _q(t), \end{aligned}$$the function \(s\rightarrow (t -s)^{\mu -1} \chi _q(s) \in L^1([0,t], R^+)\), and there exists a \(\delta >0\) such that
$$\begin{aligned} \lim _{q\rightarrow \infty } \inf \frac{\int _0^t (t-s)^{\mu -1}\chi _q(s) \mathrm{d}s}{q} = \delta < \infty , \quad t\in J. \end{aligned}$$
-
(i)
Theorem 3.3
If the hypotheses (H1), (H2), (H3) and (H4) are satisfied, then the system (1) is exactly null controllable on J provided that
Proof
For an arbitrary \(x(\cdot ),\) define the operator \(\Phi \) on \(\bar{C}\) as follows:
where
It will be shown that the operator \(\Phi \) from \(\bar{C}\) into itself has a fixed point. For each positive integer q, set \(B_q= \{v\in \bar{C},\Vert v\Vert ^2_{\bar{C}}\le q\}\). We claim that there exists a positive number q such that \(\Phi (B_q) \subseteq B_q \). If it is not true, then for each positive number q, there is a function \(x_q(\cdot )\in B_q\). But \(\Phi (x_q)\not \in B_q\), that is, \(\Vert \Phi (x_q))(t)\Vert ^2_{\bar{C}}>q\) for some \(t=t(q)\in J\), where t(q) denotes that t is dependent on q.
From (H2) and Lemma 2.5 together with Hölder inequality, we obtain
Also from (H3), Lemmas 2.3 and 2.5 together with Burkholder–Gungy’s inequality, yields
Similarly from (H3) and Lemma 2.5 together with Hölder inequality, we obtain
However, from (10), (11) and (12), we have
Dividing both sides of (13) by q and taking the lower limit \(q\rightarrow +\infty \), we get
This contradicts (8). Hence, for positive q, \(\Phi (B_q)\subseteq B_q\) for positive number q.
In fact, the operator \(\Phi \) maps \(B_q\) into a compact subset of \(B_q\). To prove this, we first show that the set \(V_q(t)=\{(\Phi x)(t):x\in B_q\}\) is a precompact in X, for every fixed \(t\in J\). This is trivial for \(t=0\), since \(V_q(0) = \{x_0\}\). Let t, \(0 <t\le b,\) be fixed. For \(0< \epsilon < t\) and arbitrary \(\kappa > 0,\) take
Since \(S(\epsilon ^\mu \kappa ),\epsilon ^\mu \kappa >0\) is a compact operator, the set \(V^{\epsilon ,\kappa }(t) =\{(\Phi ^{\epsilon ,\kappa } x)(t):x \in B_q\}\) is a precompact set in X for every \( \epsilon ,~ 0< \epsilon < t,\) and for all \(\kappa > 0\). Moreover, for \(x \in B_q,\) we have
We see that for each \(x\in B_q,\Vert (\Phi x)(t)-(\Phi ^{\epsilon ,\kappa } x)(t)\Vert ^2_{\bar{C}}\rightarrow 0\) as \(\epsilon \rightarrow 0^+\), \(\kappa \rightarrow 0^+\). Therefore, there are precompact sets arbitrarily close to the set \(V_q(t)\) and so \(V_q(t)\) is precompact in X.
Next, we prove that the family \(\{\Phi x: x \in B_q \}\) is an equicontinuous family of functions. Let \(x \in B_q\) and \(t_1,t_2~ \in J\) such that \(0<t_1 < t_2,\) then
From the above fact, we see that \(\Vert (\Phi x)(t_2)-(\Phi x)(t_1)\Vert ^2_{\bar{C}}\) tends to zero independently of \(x\in B_q\) as \(t_2\rightarrow t_1.\) The compactness of S(t) for \(t>0\) implies the continuity in the uniform operator topology. Thus, \(\Phi (B_q)\) is both equicontinuous and bounded. By the Arzela–Ascoli theorem, \(\Phi (B_q)\) is precompact in X. Hence, \(\Phi \) is a completely continuous operator on X. From the Schauder fixed point theorem, \(\Phi \) has a fixed point in \(B_q\). Any fixed point of \(\Phi \) is a mild solution of (1) on J. Therefore, the system (1) is exact null controllable on J. \(\square \)
4 An Example
In this section, we present an example to illustrate our main result. Let us consider the Sobolev-type Hilfer fractional stochastic partial differential equation with fractional Brownian motion and Poisson jump in the following form:
where \(D_{0+}^{\nu ,\frac{3}{5}}\) is the Hilfer fractional derivative, \(0\le \nu \le 1,\mu =\frac{3}{5}\) and \(B^H\) is a fractional Brownian motion. The functions \(x(t)(\xi )=x(t,\xi )\), \(F(t,x(t))(\xi )= F(t,x(t,\xi ))\), \(\sigma (t,x(t))(\xi )=\sigma (t,x(t,\xi ))\) and \(h(t,x(t),z)(\xi )=h(t, x(t,\xi ),z)\).
The bounded linear operator B is defined by \(Bu=u(t,\xi ),~0\le \xi \le 1,~u \in U\).
To study this system, let \(X=Y=U =L^2([0, 1]),\) and the operators \(A: D(A)\subset X\rightarrow X\) and \(G:D(A)\subset X\rightarrow X,t\ge 0\) be given by \(A=\frac{\partial ^2}{\partial \xi ^2}\) and \(G=1-A\) with \(D(A)=D(G)=\{x\in X;x,\frac{\partial x}{\partial \xi }\) be absolutely continuous, \(\frac{\partial ^2 x}{\partial \xi ^2}\in X,~x(0)=x(1)=0\}\). Then, A and G can be written as
Furthermore, for \(x\in X\) we have
It is known that \(AG^{-1}\) is self-adjoint and has the eigenvalues \(\lambda _n=-n^2\pi ^2,~n\in N\), with the corresponding normalized eigenvectors \(e_n(\xi )=\sqrt{2}~\sin (n\pi \xi )\). Furthermore, \(AG^{-1}\) generates a uniformly strongly continuous semigroup of bounded linear operators \(S(t),t> 0\), on a separable Hilbert space X which is given by
If \(u \in L_2(J,U),\) then \(B=I,~B^*=I\). We consider the fractional linear system
The system (15) is exact null controllable if there is a \(\gamma >0\), such that
or equivalently
If \(F=0\) and \(\sigma =0\) in (15), then the fractional linear system is exactly null controllable if
Therefore,
Hence, the linear fractional system (15) is exactly null controllable on J. So the hypothesis \((H_1)\) is satisfied. Hence, all the hypotheses of Theorem 3.3 are satisfied and
so the Sobolev-type Hilfer fractional stochastic partial differential equation with fractional Brownian motion and Poisson jump (14) is exact null controllable on J.
5 Conclusion
This paper dealt with a class of Sobolev-type Hilfer fractional stochastic differential equations with fractional Brownian motion and Poisson jumps in Hilbert spaces. By using fractional calculus, compact semigroup, fixed point theorem and stochastic analysis, we established sufficient conditions for exact null controllability of Sobolev-type stochastic differential equations with fractional Brownian motion and Poisson jumps in Hilbert spaces, where the time fractional derivative is the Hilfer derivative. Finally, an example is given to illustrate our results.
Our future work will be focused on investigating the approximate and null controllability for Sobolev-type nonlinear Hilfer fractional stochastic delay differential equations with impulsive condition in Hilbert space.
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This work is supported by Training Object of High Level and Innovative Talents of Guizhou Province ((2016)4006) and Science and Technology Program of Guizhou Province ([2017]5788).
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Ahmed, H.M., Wang, J. Exact Null Controllability of Sobolev-Type Hilfer Fractional Stochastic Differential Equations with Fractional Brownian Motion and Poisson Jumps. Bull. Iran. Math. Soc. 44, 673–690 (2018). https://doi.org/10.1007/s41980-018-0043-8
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DOI: https://doi.org/10.1007/s41980-018-0043-8
Keywords
- Sobolev type stochastic differential equations
- Fractional Brownian motion
- Poisson jumps
- Hilfer fractional derivative
- Exact null controllability.