If $a<b$ why is $a \le b$
1432
Less than or equal sign
117320
Why is this true: $\|x\|_1 \le \sqrt n \cdot \|x\|_2$?
67709
Stuck with proof for $\forall A\forall B(\mathcal{P}(A)\cup\mathcal{P}(B)=\mathcal{P}(A\cup B)\rightarrow A\subseteq B \vee B\subseteq A)$
151852
How to prove $A \subset B \iff A \cup B = B$
147237
If $A$ and $B$ are compact subsets of $\mathbb R$, then so is $\frac{A}B$.
20335
If $A\subset B$ then $\bar{A}\subset \bar{B}$
108084
Is it always true? $\left|A-B\right| \le \left|A\right| + \left|B\right|$
137494
Why is "If ψ ∈ Γ then the sequent (Γ ⊢ ψ) is correct" true?
62172
Why does $-b < a < b \iff |a| < b$?
3820
Prove that $||x|-|y||\le |x-y|$
64108
how to prove $a+b-ab \le 1$ if $a,b \in [0,1]$?
13415
How to show if $A \subseteq B$, then $A \cap B = A$?
155884
What are the conditions on $\text{tr}(AB) \leq \text{tr(A)} \text{tr(B)}$ to be true?
70552
Prove that $\mathcal{P}(A)⊆ \mathcal{P}(B)$ if and only if $A⊆B$.
50142
If sup A $\lt$ sup B show that an element of $B$ is an upper bound of $A$
158355
If $A$ commutes with $B$ and $B$ commutes with $C$, then $A$ commutes with $C$
39708
Proving $(A\le B)\vee (B\le A)$ for sets $A$ and $B$