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15
Why are outlines so essential?
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13
What is the difference betwen equivalence and isomorphism of functors in categories.
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12
Confused by proof of the irrationality of root 2: if $p^2$ is divisible by $2$, then so is $p$.
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12
How to prove that there exist no functions $f,g:\Bbb{R}\to\Bbb{R}$ such that $f(g(x))=x^{2018}$ and $g(f(x))=x^{2019}$?
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9
Difference between internal hom and exponential objects?
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9
Show that $d(x,y) = \cos(x-y) + 3$ for $x \ne y$ is a metric.
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8
Dual Map as Composition
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8
Is ${\bf Set}$ a Mal'cev category?
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8
Does anyone remember a point and click game where you play as a kid, and a space object crashes into your house?
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7
Is the field of real numbers a unique factorization domain?
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7
Joins and Meets in Preorder
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7
Anime with little dolls which look like girls in mecha suits fighting as commanded
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6
Why $p$th power are not allowed in radical extensions?
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6
Why is the direct product $\mathbb{R}\times\mathbb{R}$ undefined when $\mathbb{R}$ is viewed as a field?
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5
Vector spaces, matrices from $\mathbb R^{2\times 2}$
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5
Is $2x-y = 0$ a plane or line in 3d?
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5
Find $a\in \mathbb{Z}_5[x] /I$ so $a^3=x^2+1+I$
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5
If one vertical arrow in a pullback is an iso, then so is the other
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5
Product of infinitesimal by inverse of non infinitesimal is infinitesimal
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5
ALL unit vectors parallel to a vector
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5
How did Loki escape?
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5
Is elaborating the opposite case in brackets acceptable and clear?
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