Contents of Volume 3, Number 4

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The $\Pi\sp 1\sb 2$-singleton conjecture

Sy D. Friedman
J. Amer. Math. Soc. 3 (1990), 771-791.
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MathSciNet review: 1071116

Common range of co-analytic Toeplitz operators

John E. McCarthy
J. Amer. Math. Soc. 3 (1990), 793-799.
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MathSciNet review: 1065054

A separator theorem for nonplanar graphs

Noga Alon; Paul Seymour; Robin Thomas
J. Amer. Math. Soc. 3 (1990), 801-808.
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MathSciNet review: 1065053

Embeddability for three-dimensional CR-manifolds

Daniel M. Burns; Charles L. Epstein
J. Amer. Math. Soc. 3 (1990), 809-841.
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MathSciNet review: 1071115

Uniform tree lattices

Hyman Bass; Ravi Kulkarni
J. Amer. Math. Soc. 3 (1990), 843-902.
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MathSciNet review: 1065928

A Glimm-Effros dichotomy for Borel equivalence relations

L. A. Harrington; A. S. Kechris; A. Louveau
J. Amer. Math. Soc. 3 (1990), 903-928.
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MathSciNet review: 1057041

Group representations and lattices

Benedict H. Gross
J. Amer. Math. Soc. 3 (1990), 929-960.
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MathSciNet review: 1071117

Lattices of minimal covolume in ${\rm SL}\sb 2$: a non-Archimedean analogue of Siegel's theorem $\mu\geq\pi/21$

Alexander Lubotzky
J. Amer. Math. Soc. 3 (1990), 961-975.
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MathSciNet review: 1070003