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Mirrors > Home > MPE Home > Th. List > neleqtrrd | Structured version Visualization version GIF version |
Description: If a class is not an element of another class, it is also not an element of an equal class. Deduction form. (Contributed by David Moews, 1-May-2017.) (Proof shortened by Wolf Lammen, 13-Nov-2019.) |
Ref | Expression |
---|---|
neleqtrrd.1 | ⊢ (𝜑 → ¬ 𝐶 ∈ 𝐵) |
neleqtrrd.2 | ⊢ (𝜑 → 𝐴 = 𝐵) |
Ref | Expression |
---|---|
neleqtrrd | ⊢ (𝜑 → ¬ 𝐶 ∈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neleqtrrd.1 | . 2 ⊢ (𝜑 → ¬ 𝐶 ∈ 𝐵) | |
2 | neleqtrrd.2 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
3 | 2 | eqcomd 2616 | . 2 ⊢ (𝜑 → 𝐵 = 𝐴) |
4 | 1, 3 | neleqtrd 2709 | 1 ⊢ (𝜑 → ¬ 𝐶 ∈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1475 ∈ wcel 1977 |
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-ext 2590 |
This theorem depends on definitions: df-bi 196 df-an 385 df-ex 1696 df-cleq 2603 df-clel 2606 |
This theorem is referenced by: csbxp 5123 omopth2 7551 mreexd 16125 mreexmrid 16126 psgnunilem2 17738 lspindp4 18958 lsppratlem3 18970 frlmlbs 19955 mdetralt 20233 lebnumlem1 22568 mideulem2 25426 opphllem 25427 structiedg0val 25699 snstriedgval 25713 qqhval2lem 29353 qqhf 29358 unbdqndv1 31669 lindsenlbs 32574 mapdindp2 36028 mapdindp4 36030 mapdh6dN 36046 hdmap1l6d 36121 clsk1indlem1 37363 fnchoice 38211 stoweidlem34 38927 stoweidlem59 38952 dirkercncflem2 38997 fourierdlem42 39042 meaiininclem 39376 1hevtxdg0 40720 |
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