## Contents of Volume 324, Number 1

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- Generalized iteration of forcing
- M. Groszek and T. Jech PDF
- Trans. Amer. Math. Soc.
**324**(1991), 1-26

- Zeros of solutions and of Wronskians for the differential equation $L_ ny+p(x)y=0$
- Uri Elias PDF
- Trans. Amer. Math. Soc.
**324**(1991), 27-40

- Relative cohomology and projective twistor diagrams
- S. A. Huggett and M. A. Singer PDF
- Trans. Amer. Math. Soc.
**324**(1991), 41-57

- Box-spaces and random partial orders
- Béla Bollobás and Graham Brightwell PDF
- Trans. Amer. Math. Soc.
**324**(1991), 59-72

- Strong Bertini theorems
- Steven Diaz and David Harbater PDF
- Trans. Amer. Math. Soc.
**324**(1991), 73-86

- Nonsingular algebraic curves in $\textbf {R}\textrm {P}^ 1\times \textbf {R}\textrm {P}^ 1$
- Sachiko Matsuoka PDF
- Trans. Amer. Math. Soc.
**324**(1991), 87-107

- Boundary value problems for degenerate elliptic-parabolic equations of the fourth order
- Robert G. Root PDF
- Trans. Amer. Math. Soc.
**324**(1991), 109-134

- On vector bundles on $3$-folds with sectional genus $1$
- Edoardo Ballico PDF
- Trans. Amer. Math. Soc.
**324**(1991), 135-147

- Determinant expression of Selberg zeta functions. I
- Shin-ya Koyama PDF
- Trans. Amer. Math. Soc.
**324**(1991), 149-168

- On the interior of subsemigroups of Lie groups
- K. H. Hofmann and W. A. F. Ruppert PDF
- Trans. Amer. Math. Soc.
**324**(1991), 169-179

- On the characteristic classes of actions of lattices in higher rank Lie groups
- Garrett Stuck PDF
- Trans. Amer. Math. Soc.
**324**(1991), 181-200

- Similarity orbits and the range of the generalized derivation $X\to MX-XN$
- Allen Schweinsberg PDF
- Trans. Amer. Math. Soc.
**324**(1991), 201-211

- Optimal Hölder and $L^ p$ estimates for $\overline \partial _ b$ on the boundaries of real ellipsoids in $\textbf {C}^ n$
- Mei-Chi Shaw PDF
- Trans. Amer. Math. Soc.
**324**(1991), 213-234

- Hausdorff dimension of divergent Teichmüller geodesics
- Howard Masur PDF
- Trans. Amer. Math. Soc.
**324**(1991), 235-254

- The decompositions of Schur complexes
- Hyoung J. Ko PDF
- Trans. Amer. Math. Soc.
**324**(1991), 255-270

- A convergent framework for the multicomponent KP-hierarchy
- G. F. Helminck and G. F. Post PDF
- Trans. Amer. Math. Soc.
**324**(1991), 271-292

- Extending discrete-valued functions
- John Kulesza, Ronnie Levy and Peter Nyikos PDF
- Trans. Amer. Math. Soc.
**324**(1991), 293-302

- Periodicity and decomposability of basin boundaries with irrational maps on prime ends
- Russell B. Walker PDF
- Trans. Amer. Math. Soc.
**324**(1991), 303-317

- On the distance of subspaces of $l^ n_ p$ to $l^ k_ p$
- William B. Johnson and Gideon Schechtman PDF
- Trans. Amer. Math. Soc.
**324**(1991), 319-329

- Stable patterns in a viscous diffusion equation
- A. Novick-Cohen and R. L. Pego PDF
- Trans. Amer. Math. Soc.
**324**(1991), 331-351

- Lines on the Fermat quintic threefold and the infinitesimal generalized Hodge conjecture
- Alberto Albano and Sheldon Katz PDF
- Trans. Amer. Math. Soc.
**324**(1991), 353-368

- Noether-Lefschetz locus for surfaces
- Sung-Ock Kim PDF
- Trans. Amer. Math. Soc.
**324**(1991), 369-384

- Markov partitions for expanding maps of the circle
- Matthew Stafford PDF
- Trans. Amer. Math. Soc.
**324**(1991), 385-403

- Maximal representations of surface groups in bounded symmetric domains
- Luis Hernández PDF
- Trans. Amer. Math. Soc.
**324**(1991), 405-420

- Infinitesimal rigidity for the action of $\textrm {SL}(n,\textbf {Z})$ on $\textbf {T}^ n$
- James W. Lewis PDF
- Trans. Amer. Math. Soc.
**324**(1991), 421-445

- Symplectic double groupoids over Poisson $(ax+b)$-groups
- Kentaro Mikami PDF
- Trans. Amer. Math. Soc.
**324**(1991), 447-463