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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 5620 | 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 2143 ≠ wne 2958 ∀wral 3079 ∃wrex 3089 ⊆ wss 3906 ∅c0 4287 class class class wbr 5110 Fr wfr 5613 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1573 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-ral 3080 df-rex 3090 df-v 3457 df-dif 3909 df-ss 3923 df-pw 4565 df-sn 4591 df-fr 5616 |
| This theorem is referenced by: frc 5626 fr2nr 5640 frminex 5642 wereu 5659 wereu2 5660 frpomin 6343 fr3nr 7772 frfi 9246 fimax2g 9247 fimin2g 9460 wofib 9508 wemapso 9514 wemapso2lem 9515 noinfep 9630 cflim2 10248 isfin1-3 10371 fin12 10398 fpwwe2lem11 10627 fpwwe2lem12 10628 fpwwe2 10629 bnj110 35224 frinfm 38364 fdc 38374 fnwe2lem2 43758 sswfaxreg 45676 |
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