## Contents of Volume 257, Number 2

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- On maximally elliptic singularities
- Stephen Shing Toung Yau PDF
- Trans. Amer. Math. Soc.
**257**(1980), 269-329

- The dependence of the generalized Radon transform on defining measures
- Eric Todd Quinto PDF
- Trans. Amer. Math. Soc.
**257**(1980), 331-346

- The lattice of $l$-group varieties
- J. E. Smith PDF
- Trans. Amer. Math. Soc.
**257**(1980), 347-357

- $p$-adic gamma functions and Dwork cohomology
- Maurizio Boyarsky PDF
- Trans. Amer. Math. Soc.
**257**(1980), 359-369

- Decomposition of nonnegative group-monotone matrices
- S. K. Jain, Edward K. Kwak and V. K. Goel PDF
- Trans. Amer. Math. Soc.
**257**(1980), 371-385

- A spectral theorem for $J$-nonnegative operators
- Bernard N. Harvey PDF
- Trans. Amer. Math. Soc.
**257**(1980), 387-396

- A construction of uncountably many weak von Neumann transformations
- Karl David PDF
- Trans. Amer. Math. Soc.
**257**(1980), 397-410

- The free boundary for elastic-plastic torsion problems
- Avner Friedman and Gianni A. Pozzi PDF
- Trans. Amer. Math. Soc.
**257**(1980), 411-425

- A lower central series for split Hopf algebras with involution
- Bruce W. Jordan PDF
- Trans. Amer. Math. Soc.
**257**(1980), 427-454

- A noncommutative generalization and $q$-analog of the Lagrange inversion formula
- Ira Gessel PDF
- Trans. Amer. Math. Soc.
**257**(1980), 455-482

- On the oscillatory behavior of singular Sturm-Liouville expansions
- J. K. Shaw PDF
- Trans. Amer. Math. Soc.
**257**(1980), 483-505

- Continuously translating vector-valued measures
- U. B. Tewari and M. Dutta PDF
- Trans. Amer. Math. Soc.
**257**(1980), 507-519

- On the cohomology of real Grassmanians
- Howard L. Hiller PDF
- Trans. Amer. Math. Soc.
**257**(1980), 521-533