Welcome to our exploration of propositional formulas, the building blocks of logical reasoning!Let's start by understanding the basic components of propositional logic.We can create simple formulas using these components. Let's look at some examples.Now, let's see how we can build more complex formulas step by step.Every formula has a unique structure that can be visualized as a syntax tree.Logical equivalence means two different formulas can represent the same logical relationship.One of the most important examples is De Morgan's Law, which shows how negation distributes over AND and OR operations.Let's verify this equivalence using a truth table.As we fill in the truth table, we can see that both formulas have identical truth values for all possible inputs.A tautology is a formula that is always true, regardless of the input values.The law of excluded middle, p OR not p, is a classic example of a tautology.Let's verify this is a tautology by checking all possible values of p.Here are some other important tautologies in propositional logic.
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