Description: Principle of transitive induction, finite and non-class version. The first three hypotheses give various existences, the next three give necessary substitutions and the last two are the basis and the induction hypothesis. (Contributed by Drahflow, 12-Nov-2015) (Revised by RP, 30-May-2020) (Proof shortened by Peter Mazsa, 2-Oct-2022) (Revised by AV, 13-Jul-2024)
Ref | Expression | ||
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Hypotheses | relexpindlem.1 | |
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relexpindlem.2 | |
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relexpindlem.3 | |
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relexpindlem.4 | |
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relexpindlem.5 | |
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relexpindlem.6 | |
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relexpindlem.7 | |
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Assertion | relexpindlem | |