## Contents of Volume 290, Number 1

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- Homogeneous Borel sets of ambiguous class two
- Fons van Engelen PDF
- Trans. Amer. Math. Soc.
**290**(1985), 1-39

- Regular cardinals in models of $\textrm {ZF}$
- Moti Gitik PDF
- Trans. Amer. Math. Soc.
**290**(1985), 41-68

- Free lattice-ordered groups represented as $o$-$2$ transitive $l$-permutation groups
- Stephen H. McCleary PDF
- Trans. Amer. Math. Soc.
**290**(1985), 69-79

- An even better representation for free lattice-ordered groups
- Stephen H. McCleary PDF
- Trans. Amer. Math. Soc.
**290**(1985), 81-100

- Subspaces of $\textrm {BMO}(\textbf {R}^ n)$
- Michael Frazier PDF
- Trans. Amer. Math. Soc.
**290**(1985), 101-125

- A proof of Andrewsâ€™ $q$-Dyson conjecture for $n=4$
- Kevin W. J. Kadell PDF
- Trans. Amer. Math. Soc.
**290**(1985), 127-144

- Good and OK ultrafilters
- Alan Dow PDF
- Trans. Amer. Math. Soc.
**290**(1985), 145-160

- On twisted lifting
- Yuval Z. Flicker PDF
- Trans. Amer. Math. Soc.
**290**(1985), 161-178

- On the relative consistency strength of determinacy hypotheses
- Alexander S. Kechris and Robert M. Solovay PDF
- Trans. Amer. Math. Soc.
**290**(1985), 179-211

- Bifurcation from a heteroclinic solution in differential delay equations
- Hans-Otto Walther PDF
- Trans. Amer. Math. Soc.
**290**(1985), 213-233

- Unitary structures on cohomology
- C. M. Patton and H. Rossi PDF
- Trans. Amer. Math. Soc.
**290**(1985), 235-258

- Minimal surfaces of constant curvature in $S^ n$
- Robert L. Bryant PDF
- Trans. Amer. Math. Soc.
**290**(1985), 259-271

- On the boundary behaviour of generalized Poisson integrals on symmetric spaces
- Henrik Schlichtkrull PDF
- Trans. Amer. Math. Soc.
**290**(1985), 273-280

- Analytic uniformly bounded representations of $\textrm {SU}(1,n+1)$
- Ronald J. Stanke PDF
- Trans. Amer. Math. Soc.
**290**(1985), 281-302

- Absolutely continuous invariant measures that are maximal
- W. Byers and A. Boyarsky PDF
- Trans. Amer. Math. Soc.
**290**(1985), 303-314

- On the decomposition numbers of the finite general linear groups
- Richard Dipper PDF
- Trans. Amer. Math. Soc.
**290**(1985), 315-344

- Existence of weak solutions to stochastic differential equations in the plane with continuous coefficients
- J. Yeh PDF
- Trans. Amer. Math. Soc.
**290**(1985), 345-361

- Strongly pure subgroups of separable torsion-free abelian groups
- Loyiso G. Nongxa PDF
- Trans. Amer. Math. Soc.
**290**(1985), 363-373

- Harmonic functions on semidirect extensions of type $H$ nilpotent groups
- Ewa Damek PDF
- Trans. Amer. Math. Soc.
**290**(1985), 375-384

- Degree theory on oriented infinite-dimensional varieties and the Morse number of minimal surfaces spanning a curve in $\textbf {R}^ n$. I. $n\geq 4$
- A. J. Tromba PDF
- Trans. Amer. Math. Soc.
**290**(1985), 385-413

- Spectral properties of elementary operators. II
- Lawrence A. Fialkow PDF
- Trans. Amer. Math. Soc.
**290**(1985), 415-429