2. Building Boolean Logic

The four basic logic gates are AND, NOT, OR, XOR. Each one will be described later but the table below is a quick summary of what each one is about.

A logic gate has a standard symbol that is used to create circuit diagrams. Each one has a truth table that sets out the logic of the gate. Each one has an equivalent boolean statement that is used in writing down and simplifying boolean algebra

Boolean algebra and gate symbols
Symbol	Type of Logic	Equivalent Statement
Input A, Output Q	NOT	$$ Q = \bar A $$
Inputs A, B, Output Q	AND	$$ Q = A.B $$
Inputs A, B, Output Q	OR	$$ Q = A + B $$
Inputs A, B, Output Q	XOR	$$ Q = A \oplus B $$

Challenge see if you can find out one extra fact on this topic that we haven't already told you

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