Are all hyper-algebraic numbers algebraic?
7954
Roots of monic polynomial over a number ring
139288
Formal proof that $e^x$ is not algebraic
138569
Is the “sum of all natural numbers” unique?
48268
How many $\alpha \in S_n$ are such that $\alpha^2 = 1$?
103014
Is the real number structure unique?
145322
Sum of a Hyper-geometric series. (NBHM 2011)
5287
Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
87410
Are there real numbers that are neither rational nor irrational?
100725
Let $a$ be an algebraic number, prove that $ia$ is also algebraic
141799
Is $2^{|\mathbb{N}|} = |\mathbb{R}|$?
48127
Are there infinitely many $A\in \mathbb{C}^{2 \times 2}$ satisfying $A^3 = A$?
70332
Is there a third dimension of numbers?
18465
Sum and product of two transcendental numbers can't be both algebraic
80879
Can a quotient field ever be finitely generated as an algebra?
115502
Analogue of the Cantor-Bernstein-Schroeder theorem for general algebraic structures
86034
Is it true that for algebraic sets $V,W$ we have $I(V \times W ) =I(V) + I(W)$?
129139
Is every discrete absolute value non-archimedean?