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p --> q and q --> p are not equivalent
p --> q and q --> (not)p are equivalent
The truth table shows this.
pq p --> q q -->(not)p
f f t t
f t t t
t f f f
t t t t
where is strasbourg
The Rhine river.
Strasbourg was created in 1262.
Strasbourg's population is 272,975.
Strasbourg ended in 1681.