Complement or negative function (NOT gate or inverter)
It is also known as NOT gate. It is applied to a single input variable, being read as an inverted variable. Represented as S == not(A), and associated to a truth table. In some cases the inversion is not specified as , but as A'.
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Where:
a) It is the circuit associated to it;
b) the drawing according to the DIN norm;
c) the drawing according to the ASA norm.