Semi-conductor Devices and Electronics
14.0 De Morgan's theorem
14.0 De Morgan's theorem
$$\begin{equation} \begin{aligned} Y = \overline {A + B} \\ Y = \bar A \cdot \bar B \\\end{aligned} \end{equation} $$
NOR gate is equivalent to bubbled AND gate.
$$\begin{equation} \begin{aligned} Y = \overline {A \cdot B} \\ Y = \bar A + \bar B \\\end{aligned} \end{equation} $$
NAND gate is equivalent to bubbled OR gate.