# Tagged Questions

Questions about truth tables, conjunctive and disjunctive normal forms, negation, and implication of unquantified propositions would fit very nicely under this tag. Questions about other kind of logics should be tagged with [logic] instead.

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### proof that $\{\rightarrow, \land \}$ is not a complete set of logical connectives

I need some help to prove that the set $\{\rightarrow, \land \}$ of logical connectives is not a complete set. can someone help me to understand what should I do? thanks!
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### Is this a valid propositional natural deduction proof?

I'm new to logic and I tried to solve an exercise. Since there isn't a given answer, I'd appreciate an indication of whether this is correct ...
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### How to handle degrees (numerical attributes) in logic? How to model “quantitative changes lead to qualitative changes”?

I am using logics (propositional, predicate, modal) to model one domain, but there are variables that have non-boolean domains, these variables are degrees (it is sufficient that they are degrees, ...
All hill-stations have a lake. Ooty has two lakes. Which of the statement(s) below is/are logically valid and can be inferred from the above sentences? $(i)$ Ooty is not a hill-station. $(ii)$ No ...