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seen May 28 at 19:00

Sep
30
awarded  Explainer
Sep
2
awarded  Favorite Question
Jul
2
awarded  Famous Question
Jul
2
awarded  Curious
Apr
22
reviewed Approve Finding the 'n'th k-permutation of a set, and finding 'n' for a given k-permutation (lexicographical ordering)
Apr
22
reviewed Approve Prove that a set is not countable
Apr
22
revised hand evaluate $\sqrt{e}$
fixed error
Apr
22
comment hand evaluate $\sqrt{e}$
@MichaelHardy I see your point. If $e=\sum_{k=1}^{\infty}\frac{1}{k!}$, then how does one take a square root? Would it be $e^{\frac{1}{2}}=\sqrt{\sum_{k=1}^{\infty}\frac{1}{k!}}$?
Apr
22
answered hand evaluate $\sqrt{e}$
Apr
20
reviewed Approve Is this a correct characterisation of natural equivalence?
Apr
20
reviewed Approve Equivalence relation and equivalence class question
Apr
20
reviewed Approve Heat Equation Steady state question
Jan
3
awarded  Yearling
Dec
8
awarded  Popular Question
Jul
10
awarded  Nice Answer
Mar
13
answered On the meaning of the second derivative
Mar
6
comment How does one work backwards from an infinite series to a function?
This seems to reduce to simply finding the closed form of a series. That can't be answered in general because many different techniques exist for many different series.
Mar
6
comment Principal $n$th root of a complex number
Wikipedia says that it may be chosen in a variety of ways: "A principal root of a complex number may be chosen in various ways."
Feb
20
comment A few definite integrals
@Michael, indeed. Have a good day.
Feb
20
answered A few definite integrals