axioms of real numbers without multiplication

The Gudermannian function and Apéry's constant

How might we approach Collatz Conjecture by probabilistic method?

Is it true that $ \limsup_{T\to0+}F(0,t)=\lim_{T\to0+}\left[\sup_{0\le s<t\le T}F(s,t)\right]$?

Calculate inner product of two vectors

$X$ is a topological space s.t. every continuous $f:X\rightarrow \mathbb{R}$ is bounded. Is X compact?

What does infinity in complex analysis even mean?

Generalized limit in $l_\infty$ (Using: Hahn Banach Extension Theorem)

Why is this proof incorrect? (limit product is product of the limits)

Probability function for distance d from the center of a point picked at random in a unit disk

Is $\sum_{n=2}^{\infty}\frac{(-1)^n}{\sqrt n+(-1)^n}$ convergent?

$\frac{1}{1^2}+\frac{1}{1^2+2^2}+\frac{1}{1^2+2^2+3^2}+...\to ?\;\;$ (Click here.)

Prove that for any integer $n, n^2+4$ is not divisible by $7$.

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