## Contents of Volume 23, Number 1

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- Miscellaneous back pages, Bull. Amer. Math. Soc. (N.S.), Volume 23, Number 1 (1990)
- Bull. Amer. Math. Soc.
**23**(1990)

- Notes on invariant subspaces
- Hari Bercovici PDF
- Bull. Amer. Math. Soc.
**23**(1990), 1-36

- Miscellaneous front pages, Bull. Amer. Math. Soc. (N.S.), Volume 23, Number 1 (1990)
- Bull. Amer. Math. Soc.
**23**(1990)

- Old and new conjectured diophantine inequalities
- Serge Lang PDF
- Bull. Amer. Math. Soc.
**23**(1990), 37-75

- Towards computerized proofs of identities
- Herbert S. Wilf and Doron Zeilberger PDF
- Bull. Amer. Math. Soc.
**23**(1990), 77-83

- Splittings of surfaces
- Richard K. Skora PDF
- Bull. Amer. Math. Soc.
**23**(1990), 85-90

- Heegaard surfaces in Haken 3-manifolds
- Klaus Johannson PDF
- Bull. Amer. Math. Soc.
**23**(1990), 91-98

- Not all links are concordant to boundary links
- T. D. Cochran and K. E. Orr PDF
- Bull. Amer. Math. Soc.
**23**(1990), 99-106

- Deformation rigidity for subgroups of $SL\left ( {n,{\mathbf {Z}}} \right )$ acting on the $n$-torus
- Steven Hurder PDF
- Bull. Amer. Math. Soc.
**23**(1990), 107-113

- A nonlinear extension of the Borel density theorem: Applications to invariance of geometric structures and to smooth orbit equivalence
- Alessandra Iozzi PDF
- Bull. Amer. Math. Soc.
**23**(1990), 115-120

- Finitely generated groups, $p$-adic analytic groups, and Poincaré series
- Marcus P. F. du Sautoy PDF
- Bull. Amer. Math. Soc.
**23**(1990), 121-126

- Ramanujan graphs and Hecke operators
- Arnold K. Pizer PDF
- Bull. Amer. Math. Soc.
**23**(1990), 127-137

- Fundamental solutions and harmonic analysis on nilpotent groups
- A. Nagel, F. Ricci and E. M. Stein PDF
- Bull. Amer. Math. Soc.
**23**(1990), 139-144

- Gorenstein local homomorphisms
- Luchezar L. Avramov and Hans-Bjørn Foxby PDF
- Bull. Amer. Math. Soc.
**23**(1990), 145-150

- The jump is definable in the structure of the degrees of unsolvability
- S. Barry Cooper PDF
- Bull. Amer. Math. Soc.
**23**(1990), 151-158

- The adaption problem for approximating linear operators
- Mark A. Kon and Erich Novak PDF
- Bull. Amer. Math. Soc.
**23**(1990), 159-165