Every AND gate and OR gate is a monotone Boolean function: changing an input from zero to one while leaving all other inputs unchanged cannot change the output from one to zero. By structural induction over a Boolean circuit, a composition of these gates is also a monotone Boolean function. Constant inputs do not alter that conclusion.
Logical negation cannot be implemented, since it sends to and to , violating the defining order property. Hence these two gate types alone cannot implement every Boolean function.

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