## Contents of Volume 173

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- Mean Cesàro summability of Laguerre and Hermite series
- Eileen L. Poiani PDF
- Trans. Amer. Math. Soc.
**173**(1972), 1-31

- $\Pi ^{0}_{1}$ classes and degrees of theories
- Carl G. Jockusch and Robert I. Soare PDF
- Trans. Amer. Math. Soc.
**173**(1972), 33-56

- Automorphisms of $\omega _{1}$-trees
- Thomas J. Jech PDF
- Trans. Amer. Math. Soc.
**173**(1972), 57-70

- Iterated fine limits and iterated nontangential limits
- Kohur Gowrisankaran PDF
- Trans. Amer. Math. Soc.
**173**(1972), 71-92

- The exceptional subset of a $C_{0}$-contraction
- Domingo A. Herrero PDF
- Trans. Amer. Math. Soc.
**173**(1972), 93-115

- Analytically invariant and bi-invariant subspaces
- Domingo Antonio Herrero and Norberto Salinas PDF
- Trans. Amer. Math. Soc.
**173**(1972), 117-136

- Localizations of HNP rings
- James Kuzmanovich PDF
- Trans. Amer. Math. Soc.
**173**(1972), 137-157

- On the classification of simple antiflexible algebras
- Mahesh Chandra Bhandari PDF
- Trans. Amer. Math. Soc.
**173**(1972), 159-181

- On bounded oscillation and asymptotic expansion of conformal strip mappings
- Arthur E. Obrock PDF
- Trans. Amer. Math. Soc.
**173**(1972), 183-201

- On the genus of a group
- Arthur T. White PDF
- Trans. Amer. Math. Soc.
**173**(1972), 203-214

- Actions of groups of order $pq$
- Connor Lazarov PDF
- Trans. Amer. Math. Soc.
**173**(1972), 215-230

- The equivariant Plateau problem and interior regularity
- H. Blaine Lawson PDF
- Trans. Amer. Math. Soc.
**173**(1972), 231-249

- A class of representations of the full linear group. II
- Stephen Pierce PDF
- Trans. Amer. Math. Soc.
**173**(1972), 251-262

- On the null-spaces of elliptic partial differential operators in $R^{n}$
- Homer F. Walker PDF
- Trans. Amer. Math. Soc.
**173**(1972), 263-275

- Asymptotic behavior of linear integrodifferential systems
- Viorel Barbu and Stanley I. Grossman PDF
- Trans. Amer. Math. Soc.
**173**(1972), 277-288

- On the semisimplicity of group rings of solvable groups
- C. R. Hampton and D. S. Passman PDF
- Trans. Amer. Math. Soc.
**173**(1972), 289-301

- Closed subgroups of lattice-ordered permutation groups
- Stephen H. McCleary PDF
- Trans. Amer. Math. Soc.
**173**(1972), 303-314

- Some results on parafree groups
- Yael Roitberg PDF
- Trans. Amer. Math. Soc.
**173**(1972), 315-339

- $0\leq X^{2}\leq X$
- Ralph Gellar PDF
- Trans. Amer. Math. Soc.
**173**(1972), 341-352

- On a variation of the Ramsey number
- Gary Chartrand and Seymour Schuster PDF
- Trans. Amer. Math. Soc.
**173**(1972), 353-362

- A new class of functions of bounded index
- S. M. Shah and S. N. Shah PDF
- Trans. Amer. Math. Soc.
**173**(1972), 363-377

- Automorphisms of $\textrm {GL}_{n}(R), R$ a local ring
- J. Pomfret and B. R. McDonald PDF
- Trans. Amer. Math. Soc.
**173**(1972), 379-388

- Simple groups of order $2^{a}3^{b}5^{c}7^{d}p$
- Leo J. Alex PDF
- Trans. Amer. Math. Soc.
**173**(1972), 389-399

- The study of commutative semigroups with greatest group-homomorphism
- Takayuki Tamura and Howard B. Hamilton PDF
- Trans. Amer. Math. Soc.
**173**(1972), 401-419

- Functions and integrals
- J. Malone PDF
- Trans. Amer. Math. Soc.
**173**(1972), 421-447

- A Radon-Nikoým theorem for operator-valued measures
- Hugh B. Maynard PDF
- Trans. Amer. Math. Soc.
**173**(1972), 449-463

- Canonical neighborhoods for topologically embedded polyhedra
- Robert Craggs PDF
- Trans. Amer. Math. Soc.
**173**(1972), 465-490

- On trigonometric series associated with separable, translation invariant subspaces of $L^{\infty }(G)$
- Ron C. Blei PDF
- Trans. Amer. Math. Soc.
**173**(1972), 491-499

- A proof that $\mathcal {C}^2$ and $\mathcal {T}^2$ are distinct measures
- Lawrence R. Ernst PDF
- Trans. Amer. Math. Soc.
**173**(1972), 501-508