## Contents of Volume 180

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- The Picard group of noncommutative rings, in particular of orders
- A. Fröhlich PDF
- Trans. Amer. Math. Soc.
**180**(1973), 1-45

- Higher derivations and field extensions
- R. L. Davis PDF
- Trans. Amer. Math. Soc.
**180**(1973), 47-52

- Optimal arcs and the minimum value function in problems of Lagrange
- R. Tyrrell Rockafellar PDF
- Trans. Amer. Math. Soc.
**180**(1973), 53-83

- Dual spaces of groups with precompact conjugacy classes
- John R. Liukkonen PDF
- Trans. Amer. Math. Soc.
**180**(1973), 85-108

- The structure of Dedekind cardinals
- Erik Ellentuck PDF
- Trans. Amer. Math. Soc.
**180**(1973), 109-125

- Maximal regular right ideal space of a primitive ring. II
- Kwangil Koh and Hang Luh PDF
- Trans. Amer. Math. Soc.
**180**(1973), 127-141

- Inversion formulae for the probability measures on Banach spaces
- G. Gharagoz Hamedani and V. Mandrekar PDF
- Trans. Amer. Math. Soc.
**180**(1973), 143-169

- Orbits of families of vector fields and integrability of distributions
- Héctor J. Sussmann PDF
- Trans. Amer. Math. Soc.
**180**(1973), 171-188

- Hermitian vector bundles and value distribution for Schubert cycles
- Michael J. Cowen PDF
- Trans. Amer. Math. Soc.
**180**(1973), 189-228

- Extension of Loewner’s capacity theorem
- Raimo Näkki PDF
- Trans. Amer. Math. Soc.
**180**(1973), 229-236

- Constructing isotopes on noncompact $3$-manifolds
- Marianne S. Brown PDF
- Trans. Amer. Math. Soc.
**180**(1973), 237-263

- Variational problems within the class of solutions of a partial differential equation
- Robert Delver PDF
- Trans. Amer. Math. Soc.
**180**(1973), 265-289

- On Lagrangian groups
- J. F. Humphreys and D. L. Johnson PDF
- Trans. Amer. Math. Soc.
**180**(1973), 291-300

- On symmetric orders and separable algebras
- T. V. Fossum PDF
- Trans. Amer. Math. Soc.
**180**(1973), 301-314

- A characteristic zero non-Noetherian factorial ring of dimension three
- John David PDF
- Trans. Amer. Math. Soc.
**180**(1973), 315-325

- $P$-commutative Banach $^{\ast }$-algebras
- Wayne Tiller PDF
- Trans. Amer. Math. Soc.
**180**(1973), 327-336

- Scattering theory for hyperbolic systems with coefficients of Gevrey type
- William L. Goodhue PDF
- Trans. Amer. Math. Soc.
**180**(1973), 337-346

- Almost spherical convex hypersurfaces
- John Douglas Moore PDF
- Trans. Amer. Math. Soc.
**180**(1973), 347-358

- $C^{2}$-preserving strongly continuous Markovian semigroups
- W. M. Priestley PDF
- Trans. Amer. Math. Soc.
**180**(1973), 359-365

- Quasiconformal mappings and sets of finite perimeter
- James C. Kelly PDF
- Trans. Amer. Math. Soc.
**180**(1973), 367-387

- Homeomorphisms with polyhedral irregular sets. I
- P. F. Duvall and L. S. Husch PDF
- Trans. Amer. Math. Soc.
**180**(1973), 389-406

- A Laurent expansion for solutions to elliptic equations
- Reese Harvey and John C. Polking PDF
- Trans. Amer. Math. Soc.
**180**(1973), 407-413

- Solutions of partial differential equations with support on leaves of associated foliations
- E. C. Zachmanoglou PDF
- Trans. Amer. Math. Soc.
**180**(1973), 415-421

- Obstructions to embedding $n$-manifolds in $(2n-1)$-manifolds
- J. W. Maxwell PDF
- Trans. Amer. Math. Soc.
**180**(1973), 423-435

- On the Arens products and certain Banach algebras
- Pak Ken Wong PDF
- Trans. Amer. Math. Soc.
**180**(1973), 437-448

- Multipliers and linear functionals for the class $N^{+}$
- Niro Yanagihara PDF
- Trans. Amer. Math. Soc.
**180**(1973), 449-461

- Weak compactness in locally convex spaces
- D. G. Tacon PDF
- Trans. Amer. Math. Soc.
**180**(1973), 463-474

- Closed hulls in infinite symmetric groups
- Franklin Haimo PDF
- Trans. Amer. Math. Soc.
**180**(1973), 475-484

- Heegaard splittings of homology $3$-spheres
- Dean A. Neumann PDF
- Trans. Amer. Math. Soc.
**180**(1973), 485-495

- Barycenters, pinnacle points, and denting points
- Surjit Singh Khurana PDF
- Trans. Amer. Math. Soc.
**180**(1973), 497-503

- Addendum to: “Differential-boundary operators”
- Allan M. Krall PDF
- Trans. Amer. Math. Soc.
**180**(1973), 505

- Addendum to: “Modular representations of metabelian groups” (Trans. Amer. Math. Soc.
**169**(1972), 389–399) - B. G. Basmaji PDF
- Trans. Amer. Math. Soc.
**180**(1973), 507-508