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How to understand the truth function in discrete mathematics
Think of OR as multiplication and sum as addition.

take for example

Or true (1) false (0)

True ( 1) 2 1

False (0) 1 0

In the truth table, equal to 0 is false, and greater than 0 is true.

true ( 1) false (0)

True ( 1) 1 0

False (0) 0 0