Digital Electronics
AND-OR realization of a combinational circuit is equivalent to

 NOR-NAND realization
 NOR-NOR realization
 NAND-NAND realization
 NAND-NOR realization

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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 voltage level is lower 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

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