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If you happen to be familiar with C*-algebras and considering writing an article, here are some suggestions/articles I would like to see:

/Choi-Effros for operator systems

The representation theorem of Choi-Effros type for operator spaces (due to Ruan?)

Choi-Effros theorem for nuclear maps (stating that a *-homomorphism, from a C*-algebra into a quotient has a completely positive lift if the *-homomorphism is nuclear, in particular when the C*-algebra is nuclear.)

Voiculescu's theorem (stating that if the image a representation of a concrete C*-algebra does not contain any compact operators, then, up to unitary equivalence modulo the compacts, it is absorbed by the identity representation as a direct summand.)

Brown-Douglas-Fillmore theory (classification of essentially normal operators by their essential spectrum and Fredholm index; introduces also K-homology, a homology theory on topological spaces defined using C*-extensions. A special case of KK-theory.)

Pimsner-Voiculescu six-term exact sequence for K-theory of crossed products.

[[Elliott's ${\mathcal {O}}_{2}\otimes {\mathcal {O}}_{2}$ theorem]], which says ${\mathcal {O}}_{2}\otimes {\mathcal {O}}_{2}\simeq {\mathcal {O}}_{2}$ . This is a special case of Kirchberg-Phillips classification for Kirchberg algebras. The latter is spectacular but very technical; it's debatable whether it's advisable to have an article on it. But Elliott's theorem, IMHO, is cute and earthy enough to have an article on.