## Contents of Volume 168

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- Asymptotic formulae for the eigenvalues of a two-parameter ordinary differential equation of the second order
- M. Faierman PDF
- Trans. Amer. Math. Soc.
**168**(1972), 1-52

- One-parameter inverse semigroups
- Carl Eberhart and John Selden PDF
- Trans. Amer. Math. Soc.
**168**(1972), 53-66

- Two Hilbert spaces in which polynomials are not dense
- D. J. Newman and D. K. Wohlgelernter PDF
- Trans. Amer. Math. Soc.
**168**(1972), 67-72

- Polynomials defined by generating relations
- Hari Ballabh Mittal PDF
- Trans. Amer. Math. Soc.
**168**(1972), 73-84

- A representation theorem and approximation operators arising from inequalities involving differential operators
- D. Leviatan PDF
- Trans. Amer. Math. Soc.
**168**(1972), 85-99

- Covering relations in the lattice of $T_{1}$-topologies
- Roland E. Larson and W. J. Thron PDF
- Trans. Amer. Math. Soc.
**168**(1972), 101-111

- Semigroups satisfying variable identities. II
- Mohan S. Putcha and Julian Weissglass PDF
- Trans. Amer. Math. Soc.
**168**(1972), 113-119

- Smooth extensions in infinite dimensional Banach spaces
- Peter Renz PDF
- Trans. Amer. Math. Soc.
**168**(1972), 121-132

- A local spectral theory for operators. III. Resolvents, spectral sets and similarity
- J. G. Stampfli PDF
- Trans. Amer. Math. Soc.
**168**(1972), 133-151

- The variation of singular cycles in an algebraic family of morphisms
- Joel Roberts PDF
- Trans. Amer. Math. Soc.
**168**(1972), 153-164

- Abstract evolution equations and the mixed problem for symmetric hyperbolic systems
- Frank J. Massey PDF
- Trans. Amer. Math. Soc.
**168**(1972), 165-188

- Solvable fundamental groups of compact $3$-manifolds
- Benny Evans and Louise Moser PDF
- Trans. Amer. Math. Soc.
**168**(1972), 189-210

- The fix-points and factorization of meromorphic functions
- Fred Gross and Chung-chun Yang PDF
- Trans. Amer. Math. Soc.
**168**(1972), 211-219

- On residually finite knot groups
- E. J. Mayland PDF
- Trans. Amer. Math. Soc.
**168**(1972), 221-232

- Absolute Tauberian constants for Cesàro means
- Soraya Sherif PDF
- Trans. Amer. Math. Soc.
**168**(1972), 233-241

- A generalized area theorem for harmonic functions on hermitian hyperbolic space
- Robert Byrne Putz PDF
- Trans. Amer. Math. Soc.
**168**(1972), 243-258

- Equivariant bordism and Smith theory. III
- R. E. Stong PDF
- Trans. Amer. Math. Soc.
**168**(1972), 259-263

- The asymptotic behavior of a Fourier transform and the localization property for eigenfunction expansions for some partial differential operators
- Burton Randol PDF
- Trans. Amer. Math. Soc.
**168**(1972), 265-271

- Some degeneracy theorems for entire functions with values in an algebraic variety
- James A. Carlson PDF
- Trans. Amer. Math. Soc.
**168**(1972), 273-301

- The connectedness of the collection of arc cluster sets
- Peter Lappan PDF
- Trans. Amer. Math. Soc.
**168**(1972), 303-310

- Bounded continuous functions on a completely regular space
- F. Dennis Sentilles PDF
- Trans. Amer. Math. Soc.
**168**(1972), 311-336

- On the H. Lewy extension phenomenon
- Ricardo Nirenberg PDF
- Trans. Amer. Math. Soc.
**168**(1972), 337-356

- Knots whose branched cyclic coverings have periodic homology
- C. McA. Gordon PDF
- Trans. Amer. Math. Soc.
**168**(1972), 357-370

- Integral decomposition of functionals on $C^{\ast }$-algebras
- Herbert Halpern PDF
- Trans. Amer. Math. Soc.
**168**(1972), 371-385

- Classification of all hereditarily indecomposable circularly chainable continua
- Lawrence Fearnley PDF
- Trans. Amer. Math. Soc.
**168**(1972), 387-401

- Orbits in a real reductive Lie algebra
- L. Preiss Rothschild PDF
- Trans. Amer. Math. Soc.
**168**(1972), 403-421

- Morita theorems for functor categories
- D. C. Newell PDF
- Trans. Amer. Math. Soc.
**168**(1972), 423-433

- Locally uniform spaces
- James Williams PDF
- Trans. Amer. Math. Soc.
**168**(1972), 435-469

- Nested sequences of local uniform spaces
- James Williams PDF
- Trans. Amer. Math. Soc.
**168**(1972), 471-481

- Approximation of strictly singular and strictly cosingular operators using nonstandard analysis
- J. W. Brace and R. Royce Kneece PDF
- Trans. Amer. Math. Soc.
**168**(1972), 483-496

- Open mappings of the universal curve onto continuous curves
- David C. Wilson PDF
- Trans. Amer. Math. Soc.
**168**(1972), 497-515

- Addendum to: “On a problem of Turán about polynomials with curved majorants”
- Q. I. Rahman PDF
- Trans. Amer. Math. Soc.
**168**(1972), 517-518

- Erratum to: “On entropy and generators of measure-preserving transformations”
- Wolfgang Krieger PDF
- Trans. Amer. Math. Soc.
**168**(1972), 519

- Erratum to “Improbability of collisions in Newtonian gravitational systems”
- Donald Gene Saari PDF
- Trans. Amer. Math. Soc.
**168**(1972), 521