Hello Everybody !!

I just had to write a doctest saying "If this bipartite graph is not a
forest, then is has an even cycle"

This can of course be written "(not g.is_forest() and g.has_even_cycle())"

I would have like to have some "implication operator", to be able to write :

( not g.is_forest() => g.has_even_cycle() )

Which would of could do the very same operations (probably with a
different choice for the implication operator. Is is alreay possible ?
If not, could we do something about it ? :-)

Thanks !!!

Nathann

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