## Contents of Volume 266, Number 1

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- Nonsmooth analysis: differential calculus of nondifferentiable mappings
- A. D. Ioffe PDF
- Trans. Amer. Math. Soc.
**266**(1981), 1-56

- On two-dimensional normal singularities of type ${}_\ast A_{n}$, ${}_\ast D_{n}$ and ${}_\ast E_{n}$
- Shigeki Ohyanagi PDF
- Trans. Amer. Math. Soc.
**266**(1981), 57-69

- Standard $3$-components of type $\textrm {Sp}(6, 2)$
- Larry Finkelstein and Daniel Frohardt PDF
- Trans. Amer. Math. Soc.
**266**(1981), 71-92

- Some properties of measure and category
- Arnold W. Miller PDF
- Trans. Amer. Math. Soc.
**266**(1981), 93-114

- Neighborhood fixed pendant vertices
- S. E. Anacker and G. N. Robertson PDF
- Trans. Amer. Math. Soc.
**266**(1981), 115-128

- Fredholm and invertible $n$-tuples of operators. The deformation problem
- Raul E. Curto PDF
- Trans. Amer. Math. Soc.
**266**(1981), 129-159

- Time-ordered operators. I. Foundations for an alternative view of reality
- Tepper L. Gill PDF
- Trans. Amer. Math. Soc.
**266**(1981), 161-181

- Lifting cycles to deformations of two-dimensional pseudoconvex manifolds
- Henry B. Laufer PDF
- Trans. Amer. Math. Soc.
**266**(1981), 183-202

- Nonseparable approximate equivalence
- Donald W. Hadwin PDF
- Trans. Amer. Math. Soc.
**266**(1981), 203-231

- Absolute continuity and uniqueness of measures on metric spaces
- Pertti Mattila PDF
- Trans. Amer. Math. Soc.
**266**(1981), 233-242

- Hulls of deformations in $\textbf {C}^{n}$
- H. Alexander PDF
- Trans. Amer. Math. Soc.
**266**(1981), 243-257

- Algebraic fiber bundles
- Steven E. Landsburg PDF
- Trans. Amer. Math. Soc.
**266**(1981), 259-273

- On the convergence of closed-valued measurable multifunctions
- Gabriella Salinetti and Roger J.-B. Wets PDF
- Trans. Amer. Math. Soc.
**266**(1981), 275-289

- $C^{\ast }$-extreme points
- Alan Hopenwasser, Robert L. Moore and V. I. Paulsen PDF
- Trans. Amer. Math. Soc.
**266**(1981), 291-307

- Power series methods of summability: positivity and gap perfectness
- A. Jakimovski, W. Meyer-König and K. Zeller PDF
- Trans. Amer. Math. Soc.
**266**(1981), 309-317

- Projective geometry on partially ordered sets
- Ulrich Faigle and Christian Herrmann PDF
- Trans. Amer. Math. Soc.
**266**(1981), 319-332

- Erratum to: “Permutation-partition pairs: a combinatorial generalization of graph embeddings”
- Saul Stahl PDF
- Trans. Amer. Math. Soc.
**266**(1981), 333