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This factoring technique solves the grouping problem

Sure, here is the revised description with all the links removed: Learn how to factor by grouping when standard methods seem ...
Quanta Magazine

Galois Groups and the Symmetries of Polynomials

Before being mortally wounded in a duel at age 20, Évariste Galois discovered the hidden structure of polynomial equations. By studying the relationships between their solutions — rather than the ...