## U.S.S.R. Computational Mathematics and Mathematical Physics, Volume 5 |

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### Contents

VOL 5 No 6 CONTENTS | 1 |

Commuting translationaryinvariant operational fields 18 | 18 |

Some evaluations of Greens function for Helmholtzs | 38 |

11 other sections not shown

### Common terms and phrases

accuracy Akad algorithm application arbitrary assume asymptotic axis base-points boundary conditions boundary value problem bounded calculation Cauchy problem cavity coefficients components computation consider const constant contour convergence coordinate corresponding curve denote derivatives determined difference schemes differential equations Dirichlet problem eigenfunctions eigenvalues eigenvectors elements elliptic equa error evaluation finite fluid follows free surface function Galerkin method given Green's function inequality initial integral curve integral equation interval lattice Lemma linear mathematical matrix mesh Moscow Moscow Received motion nomograms non-linear norm obtain operator ordinary differential equations oscillations parameter plane polynomial potential Prom Proof region respect right-hand side Ritz method SAMARSKII satisfied second order Section selfadjoint sequence singular smoothing solution of equation solution of problem solving space Stefan problem Substituting symmetric Theorem theory tion transformation Translated unique variables vector velocity vychisl wave zero