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| Mirrors > Home > MPE Home > Th. List > fri | Structured version Visualization version GIF version | ||
| Description: A nonempty subset of an 𝑅-well-founded class has an 𝑅-minimal element (inference form). (Contributed by BJ, 16-Nov-2024.) (Proof shortened by BJ, 19-Nov-2024.) |
| Ref | Expression |
|---|---|
| fri | ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦𝑅𝑥) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simplr 781 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝑅 Fr 𝐴) | |
| 2 | simprl 783 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝐵 ⊆ 𝐴) | |
| 3 | simpll 779 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝐵 ∈ 𝐶) | |
| 4 | simprr 785 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝐵 ≠ ∅) | |
| 5 | 1, 2, 3, 4 | frd 5608 | 1 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦𝑅𝑥) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 ∈ wcel 2145 ≠ wne 2956 ∀wral 3077 ∃wrex 3087 ⊆ wss 3899 ∅c0 4279 class class class wbr 5103 Fr wfr 5601 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-ne 2957 df-ral 3078 df-rex 3088 df-v 3453 df-dif 3902 df-ss 3916 df-pw 4559 df-sn 4585 df-fr 5604 |
| This theorem is used by: frc 5614 fr2nr 5628 frminex 5630 wereu 5647 wereu2 5648 frpomin 6336 fr3nr 7775 frfi 9260 fimax2g 9261 fimin2g 9475 wofib 9523 wemapso 9529 wemapso2lem 9530 noinfep 9645 cflim2 10322 isfin1-3 10445 fin12 10472 fpwwe2lem11 10707 fpwwe2lem12 10708 fpwwe2 10709 bnj110 35471 frinfm 38637 fdc 38647 fnwe2lem2 44011 sswfaxreg 45929 |
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