Reputation
12,862
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
1 17 48
Newest
 Quorum
Impact
~48k people reached

5h
answered Use of Laplace transform to solve initial value problem.
5h
comment Use of Laplace transform to solve initial value problem.
For what it's worth, the partial fraction decomposition looks correct. See this WolframAlpha working out of it: bit.ly/1QgqLYr As for where their algebra goes awry ....
5h
awarded  Quorum
7h
revised Why $\lim$ of $\cos(f)$ equals to $\cos$ of $\lim(f)$?
added 523 characters in body
9h
comment What is the poetry of mathematics?
Groan. "Dubious cousin" then. I do hope my cousins aren't reading this and write me angry emails saying how they thought I always loved them and are now shocked, shocked, to discover that in using the term "dubious cousin" in a figurative sense--on a thread about poetic sensibility no less!--makes them think I literally have a lesser opinion of them.
9h
comment Prove that $\sin (\theta) + \cos(\theta) \ge 1$
@Dr.SonnhardGraubner, you're soon to hit the milestone of 10K reputation and people will assume your responses are more thoughtful. I hope you'll take all the feedback you get about your answers to heart, such as what GEdgar has written here. There are many instances where I have seen feedback on your posts which you ignore or dismiss. For your own sake, I suggest you take such feedback more seriously.
9h
comment What is the poetry of mathematics?
I did qualify it with dubious. From Oxford English Dictionary, definition 1.c: "Of questionable character: suspect, untrustworthy"
10h
comment What is the poetry of mathematics?
I mean we (mathematicians) admit that statistics is a close relative. But it isn't strictly of our lineage and often doesn't reflect our best traits. Anyway, see Bertrand Russell quote below.
10h
answered What is the poetry of mathematics?
10h
comment What is the poetry of mathematics?
Mathematics is beautiful in itself and needs no sub-class of especial beauty. Statistics if anything is the dubious step-child.
10h
awarded  Nice Answer
11h
revised Find an acute angle $\gamma$ such that $\sin \gamma + \cos \gamma= \sqrt{2}$
added 53 characters in body
11h
answered Find an acute angle $\gamma$ such that $\sin \gamma + \cos \gamma= \sqrt{2}$
11h
answered Complex Numbers and their Conjugates
13h
revised Is $\ker(\operatorname{nat}_H)=H$?
added 86 characters in body
13h
answered Is $\ker(\operatorname{nat}_H)=H$?
15h
revised $a \exp(iwt)+b \exp(-iwt)=0 \Rightarrow a = b = 0$
added 4 characters in body
15h
comment $a \exp(iwt)+b \exp(-iwt)=0 \Rightarrow a = b = 0$
One approach: Consider the cases when $t = 0$ and $t = \pi/(2w)$. This gives you two simultaneous equations in $a$ and $b$.
15h
revised $a \exp(iwt)+b \exp(-iwt)=0 \Rightarrow a = b = 0$
added 8 characters in body; edited tags
15h
answered General expression for the k-th derivative of $(\cos(x))^n$