Mathematics
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142 Answers

Votes Activity Newest
27
How can I prove $\sup(A+B)=\sup A+\sup B$ if $A+B=\{a+b\mid a\in A, b\in B\}$
Mar 3 '14 at 14:44
17
Math and mental fatigue
Apr 5 '14 at 17:03
15
How to define a bijection between $(0,1)$ and $(0,1]$?
Nov 6 '13 at 6:51
13
Union of two vector subspaces not a subspace?
Oct 26 '13 at 14:10
6
Is there any difference between mapping and function?
Jan 29 '14 at 6:49
6
Cardinality of the set of all real functions of real variable
Nov 7 '13 at 9:49
5
How can I prove $\sup(A+B)=\sup A+\sup B$ if $A+B=\{a+b\mid a\in A, b\in B\}$
Mar 3 '14 at 16:22
5
More examples of Simpson's Paradox, barring the ones on Wikipedia, Titanic, and delayed flights.
Dec 25 '17 at 17:34
5
Abductive vs. inductive reasoning
Feb 3 '17 at 5:50
5
What is the integral of 0?
Apr 29 '14 at 14:43
4
Why is the universal quantifier $\forall x \in A : P(x)$ defined as $\forall x (x \in A \implies P(x))$ using an implication?
Aug 27 '13 at 8:56
4
Why does L'Hôpital's rule work?
Mar 7 '14 at 7:52
4
Image of subgroup and Kernel of homomorphism form subgroups
Jan 8 '14 at 13:41
4
Book for proof writing
Jul 20 '13 at 14:27
3
If $A^2+2A+I_n=O_n$ then $A$ is invertible
Jul 27 '20 at 20:06
3
Typo in Spivak's explanation of limits in Calculus?
May 26 '18 at 6:42
3
Understanding the P-value
Apr 19 '19 at 20:48
3
Is “integrability” equivalent to “having antiderivative”?
Mar 9 '14 at 15:37
3
Prove $\sup(f+g) \le \sup f + \sup g$
Mar 7 '14 at 13:59
3
$H$ is a maximal normal subgroup of $G$ if and only if $G/H$ is simple.
Feb 8 '14 at 15:54
3
Is a bijective map between two groups always an isomorphism?
Feb 5 '14 at 8:16
3
Book for proof writing
Jul 20 '13 at 15:22
2
Spivak vs uncommon calc texts (Silverman, Lax, Sasane) for a rigorous introductions
Aug 20 '20 at 21:24
2
Spivak's Calculus Conic Sections Typo?
May 26 '18 at 6:36
2
Intuitively, why does Bayes' theorem work?
Jan 22 '19 at 1:25
2
Bounded sequence and every convergent subsequence converges to L
May 1 '14 at 11:39
2
Infinite number of rationals between any two reals.
Oct 30 '13 at 9:21
2
Is the pre-image of a subgroup under a homomorphism a group?
Apr 27 '14 at 17:04
2
What is the difference between an indefinite integral and an antiderivative?
Mar 13 '14 at 12:35
2
Intuition on Mean Value Theorem
Mar 9 '14 at 17:08
1
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