Is $a \le b$ a true statement if $a < b$?
1432
Less than or equal sign
93544
Nested Quantifiers true or false
155890
Does Bezout's lemma work both ways.
141799
Is $2^{|\mathbb{N}|} = |\mathbb{R}|$?
72313
Show that for all real numbers $a$ and $b$, $\,\, ab \le (1/2)(a^2+b^2)$
79697
If $A$ is a subset of $B$, then the closure of $A$ is contained in the closure of $B$.
32402
$(A \implies B) \implies (\neg B \implies \neg A)$?
132971
Prove that $|a| < b \iff -b<a<b$
81618
Prove $||a|-|b| | \leq |a-b|$
53101
Is it true that the relation |A| < |B| is a sufficient condition for claiming that $f$ is a bijection?
52880
Intuition: If $a\leq b+\epsilon$ for all $\epsilon>0$ then $a\leq b$?
136835
ZF Set Theory - If $|A|^{|B|} = |B|$, then $|A| = 1 = |B|.$
13012
Why can a = b imply 2 = 1?
100399
A doubt with a part of a certain proof.
107173
If $a\lt{b}$ and $c\le{d}$, prove that $a+c\lt b+d$
80255
How to prove that $|a-b|<\epsilon$ implies $|b|-\epsilon<|a|<|b|+\epsilon$?
155136
$x\in \{\{\{x\}\}\}$ or not?