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awarded  Nice Answer
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awarded  Popular Question
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Jun
13
asked Representation of linear transformation of matrices
Jun
3
accepted When two theorems are equivalent? [Formal definition]
May
29
awarded  Yearling
May
29
answered Evaluating $\int_{-\infty}^{\infty}e^{-x^2}dx$ using polar coordinates.
May
24
comment When two theorems are equivalent? [Formal definition]
@GregoryGrant: I mean, how can we describe mathematically that Theorem 1 and Theorem 2 are equivalent in a "formal" way, not "in words".
May
24
asked When two theorems are equivalent? [Formal definition]
Apr
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asked Understanding and teaching the concept of derivative
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awarded  Caucus
Sep
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revised Number of partitions of number n and number 3n
added 265 characters in body
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12
revised Number of partitions of number n and number 3n
added 221 characters in body
Sep
12
answered Number of partitions of number n and number 3n
Jul
28
awarded  Necromancer
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awarded  Curious
Jun
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comment What is the probability that all 4 cards have different value?
IMO the approach and the result are correct.
May
31
answered How many $3$-Letter Strings from come from $ABRACADABRA$?
May
31
comment How many $3$-Letter Strings from come from $ABRACADABRA$?
I've got only 97 strings ...