Why this Syllogism is not false?
43
Is floating point math broken?
127642
Is "incorrect facts" a contradiction in terms?
71250
Is this statement always true?
75387
A proof that $1=2$. May I know why it’s false?
65895
Irrationality proofs not by contradiction
57672
Trying to get all this terminology straight in logic
98537
What is wrong with the proof?
5293
Show that the logic $ \ \forall x \exists y \ P(x,y) \ $ is not logically equivalent to $ \ \exists x \forall y \ P(x,y) \ $
578
In classical logic, why is $(p\Rightarrow q)$ True if both $p$ and $q$ are False?
15504
In classical logic, why is $(p\Rightarrow q)$ True if $p$ is False and $q$ is True?
20789
If $\Sigma \vdash \varphi$ then $\Sigma \vdash \forall x \varphi$. Why when $(\varphi \implies \forall x \varphi)$ is not true?
22584
Can we prove that a statement cannot be proved?
141780
Possible wrong interpretation of a passage
11471
Ambiguity of “not.... because”
136577
In formal logic, how is it possible for an argument with a contradictory conclusion to be valid?
68607
Could an argument with false Premises and a true Conclusion be logically valid?
113605
In Fitch, how does one prove "(P → Q)" from the premise "(¬P ∨ Q)"?