• Shapillon@lemmy.world
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          2 months ago

          iff is the shorthand for “if and only if”.

          If you said “if it is a horse it has hooves” you can infer “all horses have hooves” but not that “all hooved creatures are horses”.

          Otoh if you said “iff a polygon has 3 sides, it is a triangle” you can infer that all polygons that have 3 sides are triangles and that there are no other ways to make triangles.

          edit: This was typed by sleep deprived me, I tried to fix it.