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History and philosophy of mathematics, biographies of mathematicians, mathematics education, recreational mathematics, communication of mathematics.
14
votes
How did Bernoulli prove L'Hôpital's rule?
Regarding the above answers, it is important to state what is considered (see this link) to be L'Hôpital rule:
$$ \lim_{x\to a} f(x)/g(x) = \lim_{x\to a} f'(x)/g'(x) $$
whenever $f(a)=g(a)=0$ and the …
8
votes
Origin of terms "flag", "flag manifold", "flag variety"?
@Jim, I always asked myself the same question. You say that the "notion of flag variety or flag manifold evolved from the older and still somewhat mysterious use of the term flag in projective geomet …