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Mirrors > Home > MPE Home > Th. List > Mathboxes > he0 | Structured version Visualization version GIF version |
Description: Any relation is hereditary in the empty set. (Contributed by RP, 27-Mar-2020.) |
Ref | Expression |
---|---|
he0 | ⊢ 𝐴 hereditary ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ima0 5938 | . . 3 ⊢ (𝐴 “ ∅) = ∅ | |
2 | 1 | eqimssi 4022 | . 2 ⊢ (𝐴 “ ∅) ⊆ ∅ |
3 | df-he 39997 | . 2 ⊢ (𝐴 hereditary ∅ ↔ (𝐴 “ ∅) ⊆ ∅) | |
4 | 2, 3 | mpbir 232 | 1 ⊢ 𝐴 hereditary ∅ |
Colors of variables: wff setvar class |
Syntax hints: ⊆ wss 3933 ∅c0 4288 “ cima 5551 hereditary whe 39996 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-sep 5194 ax-nul 5201 ax-pr 5320 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-rab 3144 df-v 3494 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-nul 4289 df-if 4464 df-sn 4558 df-pr 4560 df-op 4564 df-br 5058 df-opab 5120 df-xp 5554 df-cnv 5556 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-he 39997 |
This theorem is referenced by: (None) |
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