Reference of the polynomials satisfying $f(t+u, v)+f(t,u)=f(u+v, t)+f(u,v)$.

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Are there some reference of the polynomials satisfying $f(t+u, v)+f(t,u)=f(u+v, t)+f(u,v)$? I would like to know some of there properties. I am asking this question because these polynomials appear in the book Linear algebraic groups by Springer (page 51). Thank you very much.

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It is the equation of a 2-cocycle.