Hi, i didn’t fully understood if we treat all the basic logical gates [or,xor,and] with the same cost and delay. one more thing for clarity do we denote the delay of a circuit to be longest tpd path in the system? for example if i have a path with 5 xor gates and other path with 3 xor gates than the delay of the circuit would be 5 seconds? or long2(n)?

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All gates have constant delay and cost.

Unless you are really worried about constants, you can treat that as one.

Don’t understand the second part of your question.