Digital Electronics
The NAND gate can function as a NOT gate if

 one input is set to 0
 one input is set to 1
 inputs are left open
 all inputs are connected together

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 voltage level is lower than logic 1 voltage level.
logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is higher than logic 1 voltage level

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