3,077 reputation
1725
bio website
location
age
visits member for 2 years, 7 months
seen May 28 at 19:00

Jul
2
awarded  Famous Question
Jul
2
awarded  Curious
Apr
22
reviewed Approve suggested edit on Finding the 'n'th k-permutation of a set, and finding 'n' for a given k-permutation (lexicographical ordering)
Apr
22
reviewed Approve suggested edit on 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 suggested edit on Is this a correct characterisation of natural equivalence?
Apr
20
reviewed Approve suggested edit on Equivalence relation and equivalence class question
Apr
20
reviewed Approve suggested edit on 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
Feb
20
revised A few definite integrals
latex
Feb
5
comment Is there a way to solve $x^2 + 12y - 12x = 0$ for $x$?
As it stands, it can be further simplified: $$6\pm \sqrt{-12y+36}=6\pm \sqrt{4(-3y+9)}=6\pm 2\sqrt{-3y+9}.$$