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Mirrors > Home > MPE Home > Th. List > psseq1 | Structured version Visualization version GIF version |
Description: Equality theorem for proper subclass. (Contributed by NM, 7-Feb-1996.) |
Ref | Expression |
---|---|
psseq1 | ⊢ (𝐴 = 𝐵 → (𝐴 ⊊ 𝐶 ↔ 𝐵 ⊊ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1 3912 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) | |
2 | neeq1 2994 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) | |
3 | 1, 2 | anbi12d 634 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐴 ⊆ 𝐶 ∧ 𝐴 ≠ 𝐶) ↔ (𝐵 ⊆ 𝐶 ∧ 𝐵 ≠ 𝐶))) |
4 | df-pss 3872 | . 2 ⊢ (𝐴 ⊊ 𝐶 ↔ (𝐴 ⊆ 𝐶 ∧ 𝐴 ≠ 𝐶)) | |
5 | df-pss 3872 | . 2 ⊢ (𝐵 ⊊ 𝐶 ↔ (𝐵 ⊆ 𝐶 ∧ 𝐵 ≠ 𝐶)) | |
6 | 3, 4, 5 | 3bitr4g 317 | 1 ⊢ (𝐴 = 𝐵 → (𝐴 ⊊ 𝐶 ↔ 𝐵 ⊊ 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 = wceq 1543 ≠ wne 2932 ⊆ wss 3853 ⊊ wpss 3854 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-ext 2708 |
This theorem depends on definitions: df-bi 210 df-an 400 df-tru 1546 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-ne 2933 df-v 3400 df-in 3860 df-ss 3870 df-pss 3872 |
This theorem is referenced by: psseq1i 3990 psseq1d 3993 psstr 4005 sspsstr 4006 brrpssg 7491 sorpssuni 7498 pssnn 8824 pssnnOLD 8872 marypha1lem 9027 infeq5i 9229 infpss 9796 fin4i 9877 isfin2-2 9898 zornn0g 10084 ttukeylem7 10094 elnp 10566 elnpi 10567 ltprord 10609 pgpfac1lem1 19415 pgpfac1lem5 19420 pgpfac1 19421 pgpfaclem2 19423 pgpfac 19425 islbs3 20146 alexsubALTlem4 22901 wilthlem2 25905 spansncv 29688 cvbr 30317 cvcon3 30319 cvnbtwn 30321 dfon2lem3 33431 dfon2lem4 33432 dfon2lem5 33433 dfon2lem6 33434 dfon2lem7 33435 dfon2lem8 33436 dfon2 33438 lcvbr 36721 lcvnbtwn 36725 mapdcv 39360 |
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