29 Answers votes newest views recent 2What kind of completion is this? 7Fixed point theorems 4Are all endomorphisms of C^* just power maps? 1Triangularizing a function matrix with smooth eigenvlaues 1Algebras with countable chains only 4Double Orthogonal Complement 5Idempotent elements in matrix ring 1Categorical nomenclature 2Iterating monoid categories 3What is a de Vries algebra? 2Intersections of maximal abelian von Neumann algebras 15Proofs without words 4Reference for the Gelfand-Neumark theorem for commutative von Neumann algebras 5What is the tensor product for the Eilenberg-Moore category of a commutative monad? 8adjoint of multiplication operator in a commutative algebra 4Why does Hom need an identity in the definition of the category? 4Seemingly emergent structures in mathematics 1Definition of Initial&Terminal Objects in an ``Object-Free'' Category 4Mono- and epi-morphisms for C*-algebras 7Is there a “disjoint union” sigma algebra? 2Constructions unique up to non-unique isomorphism 2Decent Texts on Categorical Logic 5Is there a category structure one can place on measure spaces so that category-theoretic products exist? 4Why need the morphisms to form a set ? 0Associativity of polar decomposition 2Topological Content of the Kakutani Fixed Point Theorem 2What categorical mathematical structure(s) best describe the space of “localized events” in “relational quantum mechanics”? 1What is the proper name for “compact closed” multiplicative intuitionistic linear logic? 2Can adjoint linear transformations be naturally realized as adjoint functors?