Boundedness and total boundedness

Vorticity equation in index notation (curl of Navier-Stokes equation)

What is a "foo" in category theory?

Embedding torsion-free abelian groups into $\mathbb Q^n$?

Finding the fallacy in this broken proof

Show that $(1+x)(1+y)(1+z)\ge 8(1-x)(1-y)(1-z)$.

Show that any continuous $f:[0,1] \rightarrow [0,1]$ has a fixed point $\zeta$

Union of connected subsets is connected if intersection is nonempty

Weakly closed implies sequentially closed

Weak topology on an infinite-dimensional normed vector space is not metrizable

$-1 = 0$ by integration by parts of $\tan(x)$

Integral of polylogarithms and logs in closed form: $\int_0^1 \frac{du}{u}\text{Li}_2(u)^2(\log u)^2$

Learning to read complex math formulas

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