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Mar
16
comment Domain of log and its derivative
Did you mean to write $(0,\infty)$? The derivative clearly can't exist where the function being differentiated doesn't exist.
Mar
12
revised Examples where it is easier to prove more than less
deleted 7 characters in body
Mar
12
answered Examples where it is easier to prove more than less
Mar
12
comment How to explain brackets to young students
It sounds like this student has a very good understanding of brackets, something I've seen students struggle with. The problem here isn't with brackets, it's with addition.
Mar
12
comment Prove f(a)=f(b) if $\int_{-\infty}^{\infty}f(x)dx=1$
Very roughly: if f(a)>f(b) then shifting the region [a,b] left by δ would increase the integral by approximately δ(f(a)-f(b)) which would then allow you to shrink the length of the interval and still achieve the same integral.
Mar
3
awarded  Popular Question
Feb
11
awarded  Nice Answer
Dec
19
awarded  Caucus
Dec
15
comment Are the real numbers really uncountable?
@CarlMummert I'm not trying to say anything profound. Typically, in mathematics, when you want to pick a particular thing (in ZF, say) to talk about, you use a definition.
Dec
15
comment Proving $\int x \, \mathrm{d}y =xy- \int y \, \mathrm{d}x$
$\frac{dy}{dx}$ might look like a straightforward fraction, but it's not. You can't simply cancel $dx$'s without further justification.
Dec
3
comment Approximate solutions for quintic equation
See math.stackexchange.com/questions/309178/polynomial-root-finding
Nov
14
awarded  Necromancer
Nov
12
comment Cardinality of infinite sets - Help with intuition
"why can't I do the exact same thing when dealing with the mapping between odds/integers?" Have you tried?
Nov
7
comment Function 'result arity'
In my many years of mathematics I've never come across such a term.
Oct
26
answered Simplifying expressions when taking limit to infinity
Sep
18
revised why binary is read right to left
added 12 characters in body
Sep
18
revised why binary is read right to left
added 12 characters in body
Sep
18
answered why binary is read right to left
Aug
25
answered Does $G$ always have a subgroup isomorphic to $G/N$?
Aug
13
comment If $ P(A) = 0 $ is $ A $ a null event?
@user159813 The fact that the "event is a non empty set" does not make the event "non-null". The set of pairs of integers that sum to 13 is non-empty but it's impossible to roll 13 with two ordinary dice.