Journal of the American Mathematical Society

Contents of Volume 3, Number 4
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The $\Pi ^ 1_ 2$-singleton conjecture

Sy D. Friedman

J. Amer. Math. Soc. 3 (1990), 771-791

DOI: https://doi.org/10.1090/S0894-0347-1990-1071116-6

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Common range of co-analytic Toeplitz operators

John E. McCarthy

J. Amer. Math. Soc. 3 (1990), 793-799

DOI: https://doi.org/10.1090/S0894-0347-1990-1065054-2

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A separator theorem for nonplanar graphs

Noga Alon, Paul Seymour and Robin Thomas

J. Amer. Math. Soc. 3 (1990), 801-808

DOI: https://doi.org/10.1090/S0894-0347-1990-1065053-0

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Embeddability for three-dimensional CR-manifolds

Daniel M. Burns and Charles L. Epstein

J. Amer. Math. Soc. 3 (1990), 809-841

DOI: https://doi.org/10.1090/S0894-0347-1990-1071115-4

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Uniform tree lattices

Hyman Bass and Ravi Kulkarni

J. Amer. Math. Soc. 3 (1990), 843-902

DOI: https://doi.org/10.1090/S0894-0347-1990-1065928-2

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A Glimm-Effros dichotomy for Borel equivalence relations

L. A. Harrington, A. S. Kechris and A. Louveau

J. Amer. Math. Soc. 3 (1990), 903-928

DOI: https://doi.org/10.1090/S0894-0347-1990-1057041-5

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Group representations and lattices

Benedict H. Gross

J. Amer. Math. Soc. 3 (1990), 929-960

DOI: https://doi.org/10.1090/S0894-0347-1990-1071117-8

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

Alexander Lubotzky

J. Amer. Math. Soc. 3 (1990), 961-975

DOI: https://doi.org/10.1090/S0894-0347-1990-1070003-7

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