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Mirrors > Home > MPE Home > Th. List > psseq2 | Structured version Visualization version GIF version |
Description: Equality theorem for proper subclass. (Contributed by NM, 7-Feb-1996.) |
Ref | Expression |
---|---|
psseq2 | ⊢ (𝐴 = 𝐵 → (𝐶 ⊊ 𝐴 ↔ 𝐶 ⊊ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq2 3590 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐶 ⊆ 𝐴 ↔ 𝐶 ⊆ 𝐵)) | |
2 | neeq2 2845 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐶 ≠ 𝐴 ↔ 𝐶 ≠ 𝐵)) | |
3 | 1, 2 | anbi12d 743 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐶 ⊆ 𝐴 ∧ 𝐶 ≠ 𝐴) ↔ (𝐶 ⊆ 𝐵 ∧ 𝐶 ≠ 𝐵))) |
4 | df-pss 3556 | . 2 ⊢ (𝐶 ⊊ 𝐴 ↔ (𝐶 ⊆ 𝐴 ∧ 𝐶 ≠ 𝐴)) | |
5 | df-pss 3556 | . 2 ⊢ (𝐶 ⊊ 𝐵 ↔ (𝐶 ⊆ 𝐵 ∧ 𝐶 ≠ 𝐵)) | |
6 | 3, 4, 5 | 3bitr4g 302 | 1 ⊢ (𝐴 = 𝐵 → (𝐶 ⊊ 𝐴 ↔ 𝐶 ⊊ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 = wceq 1475 ≠ wne 2780 ⊆ wss 3540 ⊊ wpss 3541 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-ne 2782 df-in 3547 df-ss 3554 df-pss 3556 |
This theorem is referenced by: psseq2i 3659 psseq2d 3662 psssstr 3675 brrpssg 6837 sorpssint 6845 php 8029 php2 8030 pssnn 8063 isfin4 9002 fin2i2 9023 elnp 9688 elnpi 9689 ltprord 9731 pgpfac1lem1 18296 pgpfac1lem5 18301 lbsextlem4 18982 alexsubALTlem4 21664 spansncv 27896 cvbr 28525 cvcon3 28527 cvnbtwn 28529 cvbr4i 28610 dfon2lem6 30937 dfon2lem7 30938 dfon2lem8 30939 dfon2 30941 lcvbr 33326 lcvnbtwn 33330 lsatcv0 33336 lsat0cv 33338 islshpcv 33358 mapdcv 35967 |
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