Reputation
13,871
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
2 12 28
Newest
 Copy Editor
Impact
~199k people reached

Dec
29
comment is $G(x) = |x-2|$ one to one OR onto?
@user283411 excellent, this is exactly right
Dec
29
comment is $G(x) = |x-2|$ one to one OR onto?
@user283411 you can deduce the answer from my hints, directly -- that's the reason i gave you the hints. I would like you to think about the problem yourself, not have me tell you what the answer is.
Dec
29
comment Writing a triple integral as a single integral
@Whyka did not see that constraint, sorry...
Dec
29
comment is $G(x) = |x-2|$ one to one OR onto?
@user283411 why can you conclude it is 1-1? why do you think it is not onto? add some details.
Dec
29
comment How does integrating trigonometric functions work?
@MaxEchendu see update...
Dec
29
comment How does integrating trigonometric functions work?
@math635 you need the notion of derivative to define series expansion...
Dec
29
comment A Problem dealing with Sampling
looks correct to me :)
Dec
29
comment Looking for fast text-books
@GregoryGrant must be recent -- I read Artin in school 15 years ago or so
Dec
29
comment Writing a triple integral as a single integral
@Whyka not really, or you have to vary $r$ from $-1$ to $1$...
Dec
28
comment Integration (Struggling on the Algebra)
it does not help to post images instead of text -- i cannot read your image because of local settings here, but would be able to help if text was given instead of a pic...
Dec
22
comment Does $f''(0^+)=f''(0^-)$?
@Roland do you want to bring a source for that? no sure this either correct or universally accepted
Dec
22
comment Does $f''(0^+)=f''(0^-)$?
@Roland yes, i would argue that it would indeed have $f'(1)=0$ and this is the main difference between your function and $g(x) = e^x$.
Dec
22
comment Does $f''(0^+)=f''(0^-)$?
@Roland you differentiate all 3 branches independently and two derivatives of the constant zero function yield the zero function.
Dec
22
comment How is $9^{40}\equiv\ 1 \pmod {100}$?
@AlexM. can you teach me how to apply edits from one version to another one? or did you just manually MathJax the thing?
Dec
22
comment In how many ways can 5 identical rings be worn in 4 fingers of a hand.
@N.F.Taussig yes fixed
Dec
22
comment In how many ways can 5 identical rings be worn in 4 fingers of a hand.
@BilalKing as long as the rings are identical, it's the correct answer. If each ring is different, it would be a different story
Dec
22
comment In how many ways can 5 identical rings be worn in 4 fingers of a hand.
@RossMillikan fixed again, thanks
Dec
22
comment In how many ways can 5 identical rings be worn in 4 fingers of a hand.
@RossMillikan you are right, fixed
Dec
22
comment Which one is exponential rate of growth: doubling at each step or time-squared?
@MrAccident not sure what the other one is -- want to give an example?
Dec
21
comment contour integration problem..
edited what i could, end of last sentence nonsensical to me. which path should be taken on $C$ from $0$ to $1-i$?