How do we prove that cancellation law is hold?
10508
Algebra: What allows us to do the same thing to both sides of an equation?
62286
Suppose $G$ is a semigroup and it holds both left and right cancellation.
113344
How do we prove that something is unprovable?
131000
A proof of a criterion of vanishing of a function.
62879
Question about the proof of $GCH$ holds in $\mathbf L$
22584
Can we prove that a statement cannot be proved?
10598
Contrapositive Fitch Proof
13834
Show that G is a group, if G is finite, the operation is associative, and cancellation law holds
93410
How to prove ~ (~P & ~Q) : P ∨ Q by natural deduction
136577
In formal logic, how is it possible for an argument with a contradictory conclusion to be valid?
118812
Cancelling a Cancellation
18247
Cancellation of Direct Products
43462
Disprove $\mathcal{P}(A\Delta B) \setminus \{\emptyset\} = \mathcal{P}(A) \Delta\mathcal{P}(B) $. Is my proof good?
101738
When is absence of evidence not evidence of absence?
151561
Proving 'Law of Excluded Middle' in Fitch system
151157
Justification of proof of law of total expectation
137990
Justify each step in the following proof of Proposition 3.9 (a). I like to know if I'm in the right track and I'm also missing a few of them