# Is it possible to determine the truth values of propositional proof?

## How do you determine the truth value of propositions?

Calculating the Truth Value of a Compound Proposition

1. For a conjunction to be true, both conjuncts must be true.
2. For a disjunction to be true, at least one disjunct must be true.
3. A conditional is true except when the antecedent is true and the consequent false.

## Do propositions always have a determine truth value?

A “statement” (or “proposition”) must, by definition, have truth value; i.e., it must be either true or false.

## How many truth values are possible in propositional logic?

Classical (or “bivalent”) truth-functional propositional logic is that branch of truth-functional propositional logic that assumes that there are are only two possible truth-values a statement (whether simple or complex) can have: (1) truth, and (2) falsity, and that every statement is either true or false but not both …

## How do you know if truth value is true?

In general, to determine validity, go through every row of the truth-table to find a row where ALL the premises are true AND the conclusion is false. Can you find such a row? If not, the argument is valid. If there is one or more rows, then the argument is not valid.

## What is a propositional statement that is always true?

A propositional statement that is always true is called a tautology, while a propositional statement that is always false is called a contradiction. For instance, the statement “I will eat my dinner or I will not” is a tautology, because it allows for either instance and therefore is always true.

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