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Jul
2
asked General relationship between braid groups and mapping class groups
Jun
23
answered What does $(G:G')$ mean?
Jun
16
answered Induction of an irreducible group representation
Jun
12
answered Is the map $x\mapsto x^2+x$ uniformly continuous on $(0,\infty)$?
Jun
6
answered Dirac delta function with a sum as the argument
May
31
answered Couldn't there be a better definition of imaginary numbers?
May
30
answered Finding explicit discrete valuation of ring of germs of analytic functions on $\mathbb{C}$
May
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answered Extend isomorphism of subgroups to homomorphism of groups
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answered Maximal ideals of the ring of all continuous functions
May
29
answered How continuity of $f$ and path-connectedness of $g$ results in $f\circ g$ to be path-connected?
May
29
answered Show that the subset $\overline{I} = \{\overline{x}:x \in I\}$ is an ideal.
May
26
answered The number of $3\times 3$ nilpotent matrices over $\mathbb{F}_q$ using the Orbit-Stabilizer theorem
May
23
answered In $\mathbb Q_p$, proving every open ball is the disjoint union of more than one open ball
May
23
answered Are binomial series multiplicative in their bases?
May
22
answered Is $\mathbb{Q}(\pi) \cong \mathbb{Q}[[x]]/ \langle \sin(x) \rangle$?
May
22
answered How to visualize $\mathbb{C}^2$?
May
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answered DVR, power series expansion.
May
21
answered How to appreciate Fermat's last theorem?
May
18
answered Show that $\mathbb{C} \otimes_\mathbb{Z} \mathbb{C} \cong \mathbb{C} \otimes_\mathbb{Q} \mathbb{C}$
May
17
answered Question about ideals of a ring: $IJ=I \implies J=I$?