## Contents of Volume 241

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- The order and symbol of a distribution
- Alan Weinstein PDF
- Trans. Amer. Math. Soc.
**241**(1978), 1-54

- Groups of PL $\Lambda$-homology spheres
- Gerald A. Anderson PDF
- Trans. Amer. Math. Soc.
**241**(1978), 55-67

- Solution of the nonlinear problem $Au=N(u)$ in a Banach space
- Martin Schechter, Jack Shapiro and Morris Snow PDF
- Trans. Amer. Math. Soc.
**241**(1978), 69-78

- Ultrafilter invariants in topological spaces
- Victor Saks PDF
- Trans. Amer. Math. Soc.
**241**(1978), 79-97

- The BP homology of $H$-spaces
- Richard Kane PDF
- Trans. Amer. Math. Soc.
**241**(1978), 99-119

- Undecidable existential problems for addition and divisibility in algebraic number rings
- L. Lipshitz PDF
- Trans. Amer. Math. Soc.
**241**(1978), 121-128

- Distances between two-state Markov processes attainable by Markov joinings
- Martin H. Ellis PDF
- Trans. Amer. Math. Soc.
**241**(1978), 129-153

- Singularly perturbed boundary value problems with angular limiting solutions
- F. A. Howes PDF
- Trans. Amer. Math. Soc.
**241**(1978), 155-182

- Characterizations of amenable groups
- William R. Emerson PDF
- Trans. Amer. Math. Soc.
**241**(1978), 183-194

- Topologies on spaces of vector-valued continuous functions
- Surjit Singh Khurana PDF
- Trans. Amer. Math. Soc.
**241**(1978), 195-211

- $3$-pseudomanifolds with preassigned links
- Amos Altshuler PDF
- Trans. Amer. Math. Soc.
**241**(1978), 213-237

- On the growth of the integral means of subharmonic functions of order less than one
- Faruk F. Abi-Khuzam PDF
- Trans. Amer. Math. Soc.
**241**(1978), 239-252

- Standard and normal reductions
- R. Hindley PDF
- Trans. Amer. Math. Soc.
**241**(1978), 253-271

- Weak uniqueness sets for discrete groups
- Marek Bożejko and Tadeusz Pytlik PDF
- Trans. Amer. Math. Soc.
**241**(1978), 273-282

- Partition theorems and ultrafilters
- James E. Baumgartner and Alan D. Taylor PDF
- Trans. Amer. Math. Soc.
**241**(1978), 283-309

- Structural stability for flows on the torus with a cross-cap
- Carlos Gutiérrez PDF
- Trans. Amer. Math. Soc.
**241**(1978), 311-320

- Regular Hjelmslev planes. II
- Dieter Jungnickel PDF
- Trans. Amer. Math. Soc.
**241**(1978), 321-330

- The semigroup of varieties of Brouwerian semilattices
- Peter Köhler PDF
- Trans. Amer. Math. Soc.
**241**(1978), 331-342

- Desarguesian Klingenberg planes
- P. Y. Bacon PDF
- Trans. Amer. Math. Soc.
**241**(1978), 343-355

- Isosingular loci and the Cartesian product structure of complex analytic singularities
- Robert Ephraim PDF
- Trans. Amer. Math. Soc.
**241**(1978), 357-371

- Uniqueness in the Cauchy problem for parabolic equations
- Roger M. Hayne PDF
- Trans. Amer. Math. Soc.
**241**(1978), 373-399

- A characterization of upper-embeddable graphs
- Mark Jungerman PDF
- Trans. Amer. Math. Soc.
**241**(1978), 401-406