K
KAM (Kolmogorov-Arnold-Moser) theorem, 815 ker, 341, 601 kernel, 302 approximation integral equation, 574 spline approach, 575 tensor product, 574 congruence relation, 341 homomorphism, 341 integral equation, 563 degenerate, 574 iterated, 568, 587 resolvent, 570 solving, 568 integral transformation, 707 operator, 601 ring, 314 subspace, 317 key equation, 123 kink soliton, 550 Kirchhoff formula, 536 Klein's four-group, 302 Koch curve, 823 Korteweg de Vries equation, 547 Kronecker generalized delta, 265 product, 258 symbol. 253. 265 Kuan, 352 Kuhn-Tucker conditions, 862 reference, 626 Kuratowski theorem, 357