fatciri - brismu bridi

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Theorem fatciri 407

Description: Reverse inference form of df-fatci 405 (Contributed by la korvo, 10-Mar-2024.)

**Hypothesis**
Ref	Expression
fatciri.0	⊢ broda

**Assertion**
Ref	Expression
fatciri	⊢ 1 du'u broda kei fatci

**Proof of Theorem fatciri**
Step	Hyp	Ref	Expression
1		fatciri.0	. 2 ⊢ broda
2		df-fatci 405	. 2 ⊢ go 1 du'u broda kei fatci gi broda
3	1, 2	bi-rev 70	1 ⊢ 1 du'u broda kei fatci

Colors of variables: sumti selbri bridi

Syntax hints: 1 sdu 395 fatci sbfatci 404

This theorem was proved from axioms: ax-mp 10 ax-k 11 ax-s 14 ax-ge-le 34 ax-ge-re 35 ax-ge-in 36

This theorem depends on definitions: df-go 52 df-fatci 405

This theorem is referenced by: fatci-ceihi 408