"Prove that ∂A ∪ Int(A) = Cl(A)"
45720
Prove that $∂A$ is closed given $∂A = \text{Cl}(A) − \text{Int}(A)$
101286
How show that $|a_{n}-1|\le c\lambda ^n,\lambda\in (0,1)$
111515
Proving that $-a=(-1)\cdot a$
66293
$der(\{x\})$ is closed and $x\in der(der(A))$
99485
Prove that $1/f$ is Riemann integrable on $[a,b]$
93952
Show that $X$ can be represented as a union of disjoint equivalence classes
128256
How to prove $H_1(\mathbb{C}/\Lambda, \mathbb{Z})$ to the lattice $\Lambda$ ,$\gamma \mapsto \int_\gamma dz$ is well defined?
47680
Prove that the union of the interior of a set and the boundary of the set is the closure of the set
95935
Prove A = $(A \cap B) \cup (A \cap B^c)$ using the distributive and associative law.
86193
Rigorous proof that $dx dy=r\ dr\ d\theta$
90599
Trouble with proving $A$ is an integrally closed domain $\Rightarrow$ $A[t]$ is integrally closed domain
34702
Show $|A + uv^T| = (1 + v^T A^{-1} u) |A|$
136943
A problem with a proof about formal series in Lang's Algebra
107383
Derived sets - prove $(A \cup B)' = A' \cup B'$
50428
Proof of Neumann Lemma
98344
Prove that $\int_0^1[f''(x)]^2dx\ge4.$
13167
Prove $A = (A \setminus B) \cup (A \cap B)$