## Contents of Volume 45, Number 4

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- Miscellaneous back pages, Bull. Amer. Math. Soc., Volume 45, Number 4 (1939)
- Bull. Amer. Math. Soc.
**45**(1939)

- Miscellaneous front pages, Bull. Amer. Math. Soc., Volume 45, Number 4 (1939)
- Bull. Amer. Math. Soc.
**45**(1939)

- The dynamics of geodesic flows
- Gustav A. Hedlund PDF
- Bull. Amer. Math. Soc.
**45**(1939), 241-260

- Representation of numbers in ternary quadratic forms
- E. Rosenthall PDF
- Bull. Amer. Math. Soc.
**45**(1939), 261-263

- On approximately continuous functions
- Isaiah Maximoff PDF
- Bull. Amer. Math. Soc.
**45**(1939), 264-268

- On Fermat’s simple theorem
- Jack Chernick PDF
- Bull. Amer. Math. Soc.
**45**(1939), 269-274

- Rings as groups with operators
- C. J. Everett Jr. PDF
- Bull. Amer. Math. Soc.
**45**(1939), 274-279

- Concerning matrices with elements in a commutative ring
- Neal H. McCoy PDF
- Bull. Amer. Math. Soc.
**45**(1939), 280-284

- Cremona transformations with an invariant rational sextic
- A. B. Coble PDF
- Bull. Amer. Math. Soc.
**45**(1939), 285-288

- A note on the reduction of Gentzen’s calculus $LJ$
- H. B. Curry PDF
- Bull. Amer. Math. Soc.
**45**(1939), 288-293

- Some invariants under monotone transformations
- D. W. Hall and A. D. Wallace PDF
- Bull. Amer. Math. Soc.
**45**(1939), 294-295

- Regularity of function-to-function transformations
- Mahlon M. Day PDF
- Bull. Amer. Math. Soc.
**45**(1939), 296-303

- Bounded self-adjoint operators and the problem of moments
- B. A. Lengyel PDF
- Bull. Amer. Math. Soc.
**45**(1939), 303-306

- On the determinant of an automorph of a nonsingular skew-symmetric matrix
- John Williamson PDF
- Bull. Amer. Math. Soc.
**45**(1939), 307-309

- On Green’s functions in the theory of heat conduction in spherical coordinates
- Arnold N. Lowan PDF
- Bull. Amer. Math. Soc.
**45**(1939), 310-315

- On wave motion in an infinite solid bounded internally by a cylinder or a sphere
- Arnold N. Lowan PDF
- Bull. Amer. Math. Soc.
**45**(1939), 316-325

- Fundamental regions for the simple group of order 60 in $S_4$
- R. R. Stoll PDF
- Bull. Amer. Math. Soc.
**45**(1939), 326-329

- Diophantine equations whose members are homogeneous
- A. A. Aucoin and W. V. Parker PDF
- Bull. Amer. Math. Soc.
**45**(1939), 330-333

- A note on divisibility sequences
- Morgan Ward PDF
- Bull. Amer. Math. Soc.
**45**(1939), 334-336