## Contents of Volume 323, Number 2

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- Maxwell’s equations in a periodic structure
- Xinfu Chen and Avner Friedman PDF
- Trans. Amer. Math. Soc.
**323**(1991), 465-507

- Cavitational flows and global injectivity of conformal maps
- Massimo Lanza de Cristoforis PDF
- Trans. Amer. Math. Soc.
**323**(1991), 509-527

- On the homology of $\textrm {SU}(n)$ instantons
- Charles P. Boyer, Benjamin M. Mann and Daniel Waggoner PDF
- Trans. Amer. Math. Soc.
**323**(1991), 529-561

- Complex representations of matrix semigroups
- Jan Okniński and Mohan S. Putcha PDF
- Trans. Amer. Math. Soc.
**323**(1991), 563-581

- An $L^ 2$-cohomology construction of unitary highest weight modules for $\textrm {U}(p,q)$
- Lisa A. Mantini PDF
- Trans. Amer. Math. Soc.
**323**(1991), 583-603

- Tilings of the torus and the Klein bottle and vertex-transitive graphs on a fixed surface
- Carsten Thomassen PDF
- Trans. Amer. Math. Soc.
**323**(1991), 605-635

- Weak type $(1,1)$ estimates for heat kernel maximal functions on Lie groups
- Michael Cowling, Garth Gaudry, Saverio Giulini and Giancarlo Mauceri PDF
- Trans. Amer. Math. Soc.
**323**(1991), 637-649

- Characteristic numbers for unoriented $\textbf {Z}$-homology manifolds
- Sandro Buoncristiano and Derek Hacon PDF
- Trans. Amer. Math. Soc.
**323**(1991), 651-663

- Concentrated cyclic actions of high periodicity
- Daniel Berend and Gabriel Katz PDF
- Trans. Amer. Math. Soc.
**323**(1991), 665-689

- A cubic counterpart of Jacobi’s identity and the AGM
- J. M. Borwein and P. B. Borwein PDF
- Trans. Amer. Math. Soc.
**323**(1991), 691-701

- Distal functions and unique ergodicity
- Ebrahim Salehi PDF
- Trans. Amer. Math. Soc.
**323**(1991), 703-713

- Roots of unity and the Adams-Novikov spectral sequence for formal $A$-modules
- Keith Johnson PDF
- Trans. Amer. Math. Soc.
**323**(1991), 715-726

- Infinitely many co-existing sinks from degenerate homoclinic tangencies
- Gregory J. Davis PDF
- Trans. Amer. Math. Soc.
**323**(1991), 727-748

- Generalizations of Picard’s theorem for Riemann surfaces
- Pentti Järvi PDF
- Trans. Amer. Math. Soc.
**323**(1991), 749-763

- Strong shape for topological spaces
- Jerzy Dydak and Sławomir Nowak PDF
- Trans. Amer. Math. Soc.
**323**(1991), 765-796

- Conformal automorphisms and conformally flat manifolds
- William M. Goldman and Yoshinobu Kamishima PDF
- Trans. Amer. Math. Soc.
**323**(1991), 797-810

- A countably compact topological group $H$ such that $H\times H$ is not countably compact
- Klaas Pieter Hart and Jan van Mill PDF
- Trans. Amer. Math. Soc.
**323**(1991), 811-821

- Möbius invariant Hilbert spaces of holomorphic functions in the unit ball of $\textbf {C}^ n$
- Ke He Zhu PDF
- Trans. Amer. Math. Soc.
**323**(1991), 823-842

- Generating modules efficiently over noncommutative Noetherian rings
- S. C. Coutinho PDF
- Trans. Amer. Math. Soc.
**323**(1991), 843-856

- A nonstandard resonance problem for ordinary differential equations
- Shair Ahmad PDF
- Trans. Amer. Math. Soc.
**323**(1991), 857-875

- Multiplicity of solutions for elliptic problems with critical exponent or with a nonsymmetric term
- J. García Azorero and I. Peral Alonso PDF
- Trans. Amer. Math. Soc.
**323**(1991), 877-895

- On the spectral character of Toeplitz operators on multiply connected domains
- Kevin F. Clancey PDF
- Trans. Amer. Math. Soc.
**323**(1991), 897-910

- Locally flat $2$-knots in $S^ 2\times S^ 2$ with the same fundamental group
- Yoshihisa Sato PDF
- Trans. Amer. Math. Soc.
**323**(1991), 911-920