the side of a coin or medal bearing the principal stamp or design the more conspicuous of two alternatives or cases or sides; "the obverse of this issue
(The) Of a coin or medal That side which contains the principal device Thus, the obverse of our money coin is the side which contains the sovereign's head The other side is called the reverse
A claim formed by changing a categorical claim from affirmative to negative (or vice versa), and replacing the predicate term with its complementary term All claims are equivalent to their obverses