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Mirrors > Home > ILE Home > Th. List > 3eqtr4ri | GIF version |
Description: An inference from three chained equalities. (Contributed by NM, 2-Sep-1995.) (Proof shortened by Andrew Salmon, 25-May-2011.) |
Ref | Expression |
---|---|
3eqtr4i.1 | ⊢ 𝐴 = 𝐵 |
3eqtr4i.2 | ⊢ 𝐶 = 𝐴 |
3eqtr4i.3 | ⊢ 𝐷 = 𝐵 |
Ref | Expression |
---|---|
3eqtr4ri | ⊢ 𝐷 = 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3eqtr4i.3 | . . 3 ⊢ 𝐷 = 𝐵 | |
2 | 3eqtr4i.1 | . . 3 ⊢ 𝐴 = 𝐵 | |
3 | 1, 2 | eqtr4i 2161 | . 2 ⊢ 𝐷 = 𝐴 |
4 | 3eqtr4i.2 | . 2 ⊢ 𝐶 = 𝐴 | |
5 | 3, 4 | eqtr4i 2161 | 1 ⊢ 𝐷 = 𝐶 |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1423 ax-gen 1425 ax-4 1487 ax-17 1506 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-cleq 2130 |
This theorem is referenced by: cbvreucsf 3059 dfif6 3471 qdass 3615 tpidm12 3617 unipr 3745 dfdm4 4726 dmun 4741 resres 4826 inres 4831 resdifcom 4832 resiun1 4833 imainrect 4979 coundi 5035 coundir 5036 funopg 5152 offres 6026 mpomptsx 6088 cnvoprab 6124 snec 6483 halfpm6th 8933 numsucc 9214 decbin2 9315 fsumadd 11168 fsum2d 11197 znnen 11900 |
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