What does "either A or B" mean precisely, and how can I prove it?
118427
Does "either A or B " preclude "both A and B"?
25201
Conjunction "or" and the plural rule
52095
Prove either $G=ST$ or |$G|\geq|S|+|T|$
120292
How to formally prove: if $d\mid da+b$, then $d\mid b$?
2251
Can someone give me a hint on how to prove this?
14162
How can I prove $\sup(A+B)=\sup A+\sup B$ if $A+B=\{a+b\mid a\in A, b\in B\}$
83475
Prove Or Disprove: tr(AB)=tr(A)*tr(B)
35433
When does a dual of a compound proposition equal itself?
127296
prove that a|b and b|a iff a=+-b
52322
Implication in mathematics - How can A imply B when A is False?
18915
"A and B both are" vs. "A and B are both" vs. "Both A and B are" vs. "Both of A and B are"?
88982
Prove that for any two sets $A$ and $B$, $A\notin B$ or $B\notin A$
100399
A doubt with a part of a certain proof.
157268
Proving a bijection with absolute value
7380
Use of "Or", inclusive or exclusive?
63952
Disproving: If $(\Gamma\vdash(\phi\,\lor\psi))$, either $(\Gamma\vdash\phi)$ or $(\Gamma\vdash\psi)$ is true
89796
How should I prove the duality?