We define a general concept of pseudo algebras over theories and 2-theories.
A more restrictive such notion was introduced by Hu and Kriz, but as noticed by
M. Gould, did not capture the desired examples. The approach taken in this
paper corrects the mistake by introducing a more general concept, allowing more
flexibility in selecting coherence diagrams for pseudo algebras.Comment: 21 pages. To appear in the Advances of Mathematics. Exposition
improved, notion of operad with degeneracies removed as a simplification,
definition of pseudo algebra improved