19993,,,,.:AB,Ax,f,Bf(x),fAB,f:A~B.,.k,k.loAB,A,BCR,f:AB.2oAR,,(m1),BR,x~(x,,,xA,y~(xl,,x)B,f:AB.3oAR,BCR(n1),tA,f((t),,f,.(t))eB,f:A~B.4oACR,BR,(m,n1),x(xl,,xA,f(x,,,x~(f,(x;,,x.),,fn(x,,,x.)B,f:AB.,,R3,i(1,0,0),j~(0,1,0),k~(0,0,1)R,.,aa~ali+aZj+k.,R,f(u,v)R3,i,j,kf(u,v)=fl(u,v)i+fz(u,v)j+(u,v)k(1)(u,v),i1,2,3f(u,v),.,.,,.lo(1),.2of(t)R3,R3f(t)=f,(t)i+(t)j+(t)k(2)(2),19993.3oDRZ,(u,v)D,(1)(,)Jfl(,)J+()ddv+f3()ddV0DD(3).,..f(u,v),x~(u,v)R2.:f(u,v)x(u,v)x(u,v),f(u,v)x:axt.)=(to)afaf(u,v)Jacobix.:v),i~1,2,3,Jacobi,(u,f(u,v)x,f(u,v)x,,Jacobi,Jacohi.:(1)Jacobi,.,Jacobi,(2),f:D~R,D,fD,()(,Tlafr~~___,___.,_:,,_.__I._.r,__._._.JJ~,lJD,)j,:f(x)-l..}.t,1nfHesse.Hessenf.(3)Jacohi,.,.