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2 1 2, (Theorem 1) (Theorem 2)

3 1 2, (Theorem 1) (Theorem 2)

4 . (c.f. De Donno and Praelli, 24) (Ω, F, (F ) [,T ], P):, usual condiions, T < P : predicable σ-field on Ω [, T ] H 2 = { } X : (index se) C = C(X ), M = C (Radon measures on X ) def µ, ϕ M,C = X ϕ(x) µ(dx), µ M, ϕ C. M = {(M x ) [,T ] } x X, M x = (M x ) [,T ] H 2, x X

5 Assumpion A: sricly increasing, bounded, coninuous, adaped process, Q: Ω [, T ] X X R, P B(X ) B(X )-measurable s.. (ω, ) Ω [, T ], X X (x, y) Q ω, (x, y) R coninuous, symmeric, nonnegaive-definie. X X (x, y) E [ T Q s(x, y) da s ] R coninuous, symmeric, nonnegaive-definie. M x, M y = Q s(x, y) da s, x, y X.

6 Simple inegrand Simple inegrand: H = n h i δ x i i=1 (h i : R-valued bounded predicable process, x i X, i = 1,..., n) H M H s dm s def = n i=1 h i s dm x i s.

7 Simple inegrand H s dm s H 2 [ ( T ) 2 ] E H s dm s = E = E T T n hsh i s j d M x i, M x j s i,j=1 n hsh i sq j s (x i, x j ) da s i,j=1 [ T ] = E H s, Q s H s M,C da s., coni. symm. nonnegaive-def. Q: X X R, linear map Q: M C ; (Qµ)( ) def = Q(, y) µ(dy), µ M. X

8 Measure-valued inegrand inegrand ; H is an M-valued predicable process s.. L 2 (M, M) = H [ T ] 1/2 E H s, Q s H s M,C da s <. H L 2 (M, M), H s dm s H 2. quadraic variaion: H s dm s = H s, Q s H s M,C da s Measure-valued inegrand, Finance., L 2 (M, M) [ ] T 1/2 H E H s, Q s H s M,C da s.

9 Generalized inegrand Coni. symm. nonnegaive-def. Q: X X R linear map Q: M C, M/KerQ ) def (µ, ν) UQ = µ, Qν M,C (= Q(x, y) ν(dy)µ(dx) X X. M/KerQ compleion U Q. U Q separable Hilber space., M = {M x } x X covariance operaor Q,ω (x, y), (, ω) [, T ] Ω Hilber space U,ω = U Q,ω. (covariance spaces) Process H = (H ) [,T ] (, ω) [, T ] Ω H,ω U,ω, U-valued.

10 Generalized inegrand inegrand ; H is a U-valued predicable process s.. L 2 (M, U) = H [ T ] 1/2 def H M = E H s 2 U s da s <. (L 2 (M, U), M ) Hilber space. H L 2 (M, U), ( ) H s dm s H 2. H s dm H s 2 = H M. L 2 (M, U) Finance.. BSDE

11 1 2, (Theorem 1) (Theorem 2)

12 , (Theorem 1) M = {M x } x X (given). f ξ, BSDE(f, ξ); T T T Y = ξ + f (s, Y s, H s ) da s H s dm s dn s, [, T ] riple (Y, H, N). BSDE(f, ξ) Finance ξ : (F T - ) f : Y : ξ (adaped process) H: ( ) N : cos process.

13 , (Theorem 1) BSDE(f, ξ); Y = ξ + T Assumpion f (s, Y s, H s ) da s T H s dm s T dn s, [, T ] ξ L 2 (F T, P) f {(ω, s, y, h) ω Ω, s [, T ], y R, h U s,ω } ( ), ; [ ] T 1 E f (ω,,, )2 da (ω) <. 2 η, θ : posiive, bounded, predicable processes s.. f (, y 1, K 1 ) f (, y 2, K 2 ) η y 1 y 2 + θ K 1 K 2 U for any y 1, y 2 R and U-valued processes K 1, K 2. (f, ξ) sandard daa.

14 , (Theorem 1) BSDE(f, ξ); Y = ξ + T Definiion f (s, Y s, H s ) da s T H s dm s T dn s, [, T ] (f, ξ): sandard daa. riple (Y, H, N) BSDE(f, ξ) ; [ ] T Y : R-valued càdlàg adaped, E Y 2 da <. H L 2 (M, U) N H 2, srongly orhogonal o M = {M x } x X. (i.e. N, M x, x X ) (Y, H, N) (f, ξ).

15 , (Theorem 1) BSDE(f, ξ); Y = ξ + T f (s, Y s, H s ) da s T Theorem 1 (, H. 218) H s dm s T dn s, [, T ] (f, ξ): sandard daa, BSDE(f, ξ) (Y, H, N). Remark (Economic inerpreaion) H L 2 (M, U) ξ,., Finance, H.

16 (Theorem 2) BSDE,. {x 1, x 2,... } X. n N, n. M n def = (M x 1,..., M xn ) M n - (n ) L 2 (M n, R n ). H L 2 (M n, R n ), H s dm n s H 2.

17 (Theorem 2) Lemma n N: fix. H = (H 1,..., H n ) L 2 (M n, R n ), measure-valued inegrand H = n i=1 Hi δ xi, H L 2 (M, U), H s dm n s = H s dm s., L 2 (M n, R n ) L 2 (M, U).

18 (Theorem 2) n N: fix. Sandard daa (f, ξ), BSDE n (f, ξ) ; Y n = ξ + Definiion T f (s, Y n s, H n s ) da s T H n s dm n s T n N, (f, ξ): sandard daa. riple (Y n, H n, N n ) BSDE n (f, ξ) ; [ ] Y n T : R-valued càdlàg adaped, E (Y n ) 2 da <. H n L 2 (M n, R n ) dn n s, [, T ] N n H 2, srongly orhogonal o M n = (M x 1,..., M xn ). (i.e. N, M x i, i = 1,..., n) (Y n, H n, N n ) n (f, ξ)., (c.f. Carbone, Ferrario, and Sanacroce, 27).

19 (Theorem 2) Theorem 2 (, H. 218) (f, ξ): sandard daa. (Y, H, N) BSDE(f, ξ), n N (Y n, H n, N n ) BSDE n (f, ξ). ; lim = Y n in L 2 (da dp), lim n Hn = H in L 2 (M, U), lim n Nn = N in H 2., γ >, n N. Y Y n 2 L 2 (da dp) + H Hn 2 M γ N Nn 2 H 2

20 (Theorem 2) Remark (Economic inerpreaion) n N, M n = (M x 1,..., M xn ) n-h small marke ( M ), L 2 (M n, R n ). BSDE n (f, ξ) (Y n, H n, N n ), H n n-h small marke ( ) (c.f. Schweizer, 28). Theorem 2,, small marke ( ).

21 (Theorem 2), 1/5 α 2 = 1 + η + θ 2, K = α2 s da s, β > ( ), L 2 (da dp) [ T ] 1/2 def X T,β = E e βk X 2 da. M,β, H 2,β. δ n Y = Y Y n, δ n H = H H n, δ n N = N N n. α, K,. αδ n Y 2 T,β + δ nh 2 M,β + δ nn 2 H 2,β

22 (Theorem 2), 2/5 e βk δ n Y 2 ; E [e βk T δ n Y T 2] E [ δ n Y 2] [ T ] = E e βk (βα 2 δ n Y 2 2δ n Y (f (, Y, H ) f (, Y n, H n ))) da [ T )] + E e ( δ βk n H 2 U da + d δ n N + 2d δ n H s dm s, δ n N β αδ n Y 2 T,β + δ nh 2 M,β + δ nn 2 H 2,β [ T ] E e βk 2 δ n Y f (, Y, H ) f (, Y n, H n ) da [ T ] + 2E e βk d δ n H s dm s, δ n N 2 1

23 (Theorem 2), 3/5 1 [ ] T E eβk 2 δ n Y f (, Y, H ) f (, Y n, H n ) da f Lipschiz 2ab µ 2 a 2 + b2 for all a, b R and µ > µ 2, µ > 1 (2 + µ 2 ) αδ n Y 2 T,β + 1 µ 2 δ nh 2 M,β.

24 (Theorem 2), 4/5 2 [ T 2E eβk d δ nh s dm s, δ n N ] Ĥ n s,ω H s,ω U s,ω (span{δ x1,..., δ xn }). Ĥn L 2 (M, U), H Ĥn L 2 (M n, R n ) δ n N = N N n M n = (M x 1,..., M xn ) srongly orhogonal, δ n H s dm s, δ n N = Ĥ n s dm s, δ n N. Kunia Waanabe ineq., [ T ] 2 2E e βk Ĥn 2 U da δ nn 2 H 2,β.

25 (Theorem 2), 5/5 β, µ > n N, ( β 2 µ 2 ) αδ n Y 2 T,β + ( 1 1 µ 2 ) δ n H 2 M,β δ nn 2 H 2,β [ T 2E e βk Ĥn 2 U da ]. (β > 3, µ >, >.) lim n Ĥn,ω U,ω =,, ω, e βk Ĥn 2 U e βk H 2 U L 1 (da dp), n N, [ T ] E e βk Ĥn 2 n U da.

26 R. Carbone, B. Ferrario, and M. Sanacroce. Backward sochasic differenial equaions driven by càdlàg maringales. Teor. Veroyan. Primen., 52(2): , 27. M. De Donno and M. Praelli. On he use of measure-valued sraegies in bond markes. Finance Soch., 8(1):87 19, 24. Y. Hamaguchi. BSDEs driven by cylindrical maringales wih applicaion o approximae hedging in bond markes. ArXiv e-prins, June 218. M. Schweizer. Local risk-minimizaion for mulidimensional asses and paymen sreams. In Advances in mahemaics of finance, volume 83 of Banach Cener Publ., pages Polish Acad. Sci. Ins. Mah., Warsaw, 28.

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