Digital Electronics
An exclusive NOR gate is logically equivalent to

 X-OR gate followed by an inverter
 inverter followed by an X-OR gate
 complement of a NOR gate
 NOT gate followed by a NOR gate

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

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

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