I think the truth value of F ⇒ T should be undefined.
15504
In classical logic, why is $(p\Rightarrow q)$ True if $p$ is False and $q$ is True?
129185
Understanding the truth value for ⇏ when antecedent is false and consequent is true.
72660
How can I show that $f$ must be zero if $\int fg$ is always zero?
126713
Strong induction and vacuous truth
113804
Why does $F=ma$? Is there a straightforward reason?
94617
Showing Consistency and Completeness implies a unique truth assignment
72064
True,  false,  or meaningless?
119815
Why is $\tan((1/2)\pi)$ undefined?
29629
Distinguishing between valid and fallacious arguments (propositional calculus)
47222
Soundness of a rule of a proof system with respect to the truth tables?
147528
Where's the error in this $2=1$ fake proof?
124424
How to show that there is a deduction of $\varphi\leftrightarrow\psi$
128332
Counterexample to "Measurable in each variable separately implies measurable"
64075
Prove that a set of connectives is inadequate
122015
"This statement is false" - Propositional Logic
7132
Finding a clear difference between truth and fact
103342
Why should we care about syntactic proofs if we can show semantically that statements are true?