184 reputation
5
bio website inf.puc-rio.br/~hgualandi
location Brazil
age 24
visits member for 3 years, 8 months
seen Sep 28 at 20:43

May
23
revised Troll Maths : Bijection between P(N) and N?
latex the examples.
May
23
suggested approved edit on Troll Maths : Bijection between P(N) and N?
Feb
1
revised If $f(x) = h(x)g(x)$, is $h$ differentiable if $f$ and $g$ are?
make it clearer whoe is differentiable and who isn't
Feb
1
suggested approved edit on If $f(x) = h(x)g(x)$, is $h$ differentiable if $f$ and $g$ are?
Jan
27
comment Calculate intersection of two ellipses
I don't understand - are the ellipses alligned, sharing a major axis?
Jan
3
comment An example of an easy to understand undecidable problem
@miracle173. Thanks! (btw, if I remember correctly you can add invisible html comments <!-- --> to bypass the edit size limit if you need to fix typos in the future)
Jan
3
revised An example of an easy to understand undecidable problem
edited body
Dec
15
comment Prove $2^{1/3}$ is irrational.
You can't prove something starting by assuming what you want to prove.
Dec
5
answered Why is there implied an equality between vectors and $n$-tuples?
Dec
5
comment Help with epsilon-delta proof of continuity
eps-delta is traditionally hard because it is one of the first times you encounter a statement with nested exists and for-all quantifiers. The problem is that unless you can specify a specific problem you are having I don~t think anyone here will come up with an explanation that is much better then the one in your textbook.
Nov
24
revised
added link (the exact more-info link is not necessarily self-descriptive)
Nov
24
suggested approved edit on
Nov
22
answered Complexity of sorting algorthms
Nov
10
awarded  Teacher
Nov
10
revised An example of an easy to understand undecidable problem
added 559 characters in body
Nov
10
awarded  Editor
Nov
10
revised An example of an easy to understand undecidable problem
added 559 characters in body
Nov
10
answered An example of an easy to understand undecidable problem
Oct
17
awarded  Scholar
Oct
17
accepted An inequality on a convex function