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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 780 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝑅 Fr 𝐴) | |
| 2 | simprl 782 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝐵 ⊆ 𝐴) | |
| 3 | simpll 778 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝐵 ∈ 𝐶) | |
| 4 | simprr 784 | . 2 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → 𝐵 ≠ ∅) | |
| 5 | 1, 2, 3, 4 | frd 5619 | 1 ⊢ (((𝐵 ∈ 𝐶 ∧ 𝑅 Fr 𝐴) ∧ (𝐵 ⊆ 𝐴 ∧ 𝐵 ≠ ∅)) → ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦𝑅𝑥) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 ∈ wcel 2149 ≠ wne 2964 ∀wral 3085 ∃wrex 3095 ⊆ wss 3913 ∅c0 4294 class class class wbr 5113 Fr wfr 5612 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1570 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-ne 2965 df-ral 3086 df-rex 3096 df-v 3465 df-dif 3916 df-ss 3930 df-pw 4569 df-sn 4595 df-fr 5615 |
| This theorem is referenced by: frc 5625 fr2nr 5639 frminex 5641 wereu 5658 wereu2 5659 frpomin 6342 fr3nr 7771 frfi 9245 fimax2g 9246 fimin2g 9459 wofib 9507 wemapso 9513 wemapso2lem 9514 noinfep 9629 cflim2 10247 isfin1-3 10370 fin12 10397 fpwwe2lem11 10626 fpwwe2lem12 10627 fpwwe2 10628 bnj110 35191 frinfm 38274 fdc 38284 fnwe2lem2 43670 sswfaxreg 45588 |
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