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May
21
answered The free monoid functor is fully faithful?
May
19
answered Question about limit and dividing by zero
May
19
answered Can a nonempty set ever equal its Cartesian product with another set?
May
19
answered Base of the $\mathbb{R}$ vector space that contains all real functions: $f(x) \not= 0$ for finitely many x $\in\mathbb{R}$
May
19
answered Possible textbook redundancy concerning invertible mappings
May
18
answered Brouwer's fixed-point theorem and the intermediate value theorem?
May
17
answered How to explain that $A \implies B$ is true when $A$ is false
May
14
answered Dual space of a finite dimensional
May
14
answered Dual space of a finite dimensional is finite dimensional
May
8
answered Proof without using induction
May
8
answered Why are both of the conditions of Bolzano -Weierstrass theorem necessary?
May
4
answered Construct a non-linear function that shows that the intervals $[2,4]$ and $[10,22]$ have the same cardinality
May
4
answered Why is the inclusion of the $ 0 $-vector part of the definition of a subspace?
May
3
answered Question about the Range of a sequence
May
3
answered The distance between two sets does not change if closure is taken
May
3
answered Why represent a complex number $a+ib$ as $[\begin{smallmatrix}a & -b\\ b & \hphantom{-}a\end{smallmatrix}]$?
May
3
answered Elements and arrows in an abelian category.
May
3
answered Intuition: Why is the biconditional true if both statements are false?
May
1
answered Why $P( A \cup B) \geq P(B)$?
Apr
30
answered Why did mathematicians introduce the concept of uniform continuity?