## Proceedings of the Cambridge Philosophical Society: Mathematical and Physical Sciences |

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### Contents

On semigroups 387 | 53 |

B Invariant groups associated with an algebraic surface 414 | 84 |

Steen S W P Introduction to the theory of operators V Metric rings | 139 |

23 other sections not shown

### Common terms and phrases

accretion adsorbed adsorption approximation atomic biharmonic boundary calculated Cambridge Phil canonical curve cardioid cluster coefficients collisions components consider constant containing corresponding cross-ratio cross-section defined denote density deuteron differential equation dipole directrix distance effect electrons emission emitted energy expression field finite follows formula fundamental scroll G. H. HARDY given gives Hence hydrogen hysteresis idempotent integral interaction ionization ions isotropic lattice Lemma lines magnetic matrix element mean free path meson method molecules neutron non-zero obtained operator osculating paper particles Phys plane pole positive possible pressure prime problem Proc projection proton quadric quantum radiation radius recombination satisfied scalar second layer semi-group shown solution stars stream function superconducting suppose surface temperature tensor thallium theorem theory transformation united spaces variation vector velocity wave functions y-rays zero