Note that “a sufficient condition for s is r” means r is a sufficient condition for s and that “a necessary condition for s is r” means r is a necessary condition for s. Rewrite the statement in if-then form.
Some programming languages use statements of the form “r unless sn” to mean that as long as s does not happen, then r will happen. More formally:
Definition: If r and s are statements,
r unlesss means if ~s then r.
Exercise
A sufficient condition for Jon’s team to win the championship is that it win the rest of its games.
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