New, mainly disambiguation, entry affine algebra. Note that affine algebra for most algebraists is not the same as affine Lie algebra. I have corrected a wrong link in Wess-Zumino model which links to affine algebra instead to affine Lie algebra; let us be careful when linking in future. Affine algebras are coordinate rings of affine varieties. I have split affine variety from algebraic variety which also got a redirect algebraic manifold (= smooth algebraic variety). New entry Igor Shafarevich.

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