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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-pr1eq | Structured version Visualization version GIF version |
Description: Substitution property for pr1. (Contributed by BJ, 6-Apr-2019.) |
Ref | Expression |
---|---|
bj-pr1eq | ⊢ (𝐴 = 𝐵 → pr1 𝐴 = pr1 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-projeq2 32981 | . 2 ⊢ (𝐴 = 𝐵 → (∅ Proj 𝐴) = (∅ Proj 𝐵)) | |
2 | df-bj-pr1 32989 | . 2 ⊢ pr1 𝐴 = (∅ Proj 𝐴) | |
3 | df-bj-pr1 32989 | . 2 ⊢ pr1 𝐵 = (∅ Proj 𝐵) | |
4 | 1, 2, 3 | 3eqtr4g 2681 | 1 ⊢ (𝐴 = 𝐵 → pr1 𝐴 = pr1 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1483 ∅c0 3915 Proj bj-cproj 32978 pr1 bj-cpr1 32988 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-br 4654 df-opab 4713 df-xp 5120 df-cnv 5122 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-bj-proj 32979 df-bj-pr1 32989 |
This theorem is referenced by: bj-pr11val 32993 bj-1uplth 32995 bj-pr21val 33001 bj-2uplth 33009 |
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