Contents of Volume 21, Number 4

All articles in this issue are freely accessible.

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Minima of functions of lines

Elizabeth LeStourgeon.
Trans. Amer. Math. Soc. 21 (1920), 357-383
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MathSciNet review: 1501150

Invariants of infinite groups in the plane

Eugene Francis Simonds.
Trans. Amer. Math. Soc. 21 (1920), 384-390
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MathSciNet review: 1501151

On triply orthogonal congruences

James Byrnie Shaw.
Trans. Amer. Math. Soc. 21 (1920), 391-408
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MathSciNet review: 1501152

A set of properties characteristic of a class of congruences connected with the theory of functions

E. J. Wilczynski.
Trans. Amer. Math. Soc. 21 (1920), 409-445
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MathSciNet review: 1501153

On the equilibrium of a fluid mass at rest

James W. Alexander.
Trans. Amer. Math. Soc. 21 (1920), 446-450
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MathSciNet review: 1501154

Concerning approachability of simple closed and open curves

John Robert Kline.
Trans. Amer. Math. Soc. 21 (1920), 451-458
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MathSciNet review: 1501155