obverse

n 1: the more conspicuous of two alternatives or cases or sides:

"the obverse of this issue"

2: the side of a coin or medal bearing the principal stamp or

design [ant: {reverse}]

converse

The truth of a {proposition} of the form A ◦> B and its

converse B ◦> A are shown in the following truth table:

A B | A ◦> B B ◦> A

------:----------------

f f | t t

f t | t f

t f | f t

t t | t t