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Mirrors > Home > MPE Home > Th. List > Mathboxes > 0he | Structured version Visualization version GIF version |
Description: The empty relation is hereditary in any class. (Contributed by RP, 27-Mar-2020.) |
Ref | Expression |
---|---|
0he | ⊢ ∅ hereditary 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ima 5736 | . . 3 ⊢ (∅ “ 𝐴) = ∅ | |
2 | 0ss 4198 | . . 3 ⊢ ∅ ⊆ 𝐴 | |
3 | 1, 2 | eqsstri 3854 | . 2 ⊢ (∅ “ 𝐴) ⊆ 𝐴 |
4 | df-he 39023 | . 2 ⊢ (∅ hereditary 𝐴 ↔ (∅ “ 𝐴) ⊆ 𝐴) | |
5 | 3, 4 | mpbir 223 | 1 ⊢ ∅ hereditary 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: ⊆ wss 3792 ∅c0 4141 “ cima 5358 hereditary whe 39022 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1839 ax-4 1853 ax-5 1953 ax-6 2021 ax-7 2055 ax-9 2116 ax-10 2135 ax-11 2150 ax-12 2163 ax-13 2334 ax-ext 2754 ax-sep 5017 ax-nul 5025 ax-pr 5138 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 837 df-3an 1073 df-tru 1605 df-ex 1824 df-nf 1828 df-sb 2012 df-mo 2551 df-eu 2587 df-clab 2764 df-cleq 2770 df-clel 2774 df-nfc 2921 df-ral 3095 df-rex 3096 df-rab 3099 df-v 3400 df-dif 3795 df-un 3797 df-in 3799 df-ss 3806 df-nul 4142 df-if 4308 df-sn 4399 df-pr 4401 df-op 4405 df-br 4887 df-opab 4949 df-xp 5361 df-cnv 5363 df-dm 5365 df-rn 5366 df-res 5367 df-ima 5368 df-he 39023 |
This theorem is referenced by: (None) |
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