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...100]}} | {{harvnb|Carlson|2024|loc=§ History of topology}} }}</ref> In the 1940s and 50s, [[homological algebra]] emerged, employing algebraic techniques to ...es in Group Theory: Rubik's Cube, Merlin's Machine, and Other Mathematical Toys |publisher=Johns Hopkins University Press |isbn=978-0-8018-9012-3 |edition= ...

...gy'', 1967, p. 436; note use of "Big G's" vs. "little g's" as early as the 1940s of the [[Einstein tensor]] ''G''_''μν'' vs. the [[metric tensor]] ...