Three forms of mathematical induction: Difference between revisions

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* The ''first'' case is [[vacuous truth|vacuously true]];
* the step that goes from the ''n''th case to the (''n'' + 1)th case is trivial if ''n'' ≥ 2 and impossible if ''n'' = 1;
* the substantial part of the proof is the ''second case'', and the second case;
* the second case is relied on in the trivial induction step.