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| Mirrors > Home > ILE Home > Th. List > fvprc | GIF version | ||
| Description: A function's value at a proper class is the empty set. (Contributed by NM, 20-May-1998.) |
| Ref | Expression |
|---|---|
| fvprc | ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brprcneu 5632 | . 2 ⊢ (¬ 𝐴 ∈ V → ¬ ∃!𝑥 𝐴𝐹𝑥) | |
| 2 | tz6.12-2 5630 | . 2 ⊢ (¬ ∃!𝑥 𝐴𝐹𝑥 → (𝐹‘𝐴) = ∅) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (¬ 𝐴 ∈ V → (𝐹‘𝐴) = ∅) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1397 ∃!weu 2079 ∈ wcel 2202 Vcvv 2802 ∅c0 3494 class class class wbr 4088 ‘cfv 5326 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-setind 4635 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-ral 2515 df-rex 2516 df-v 2804 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-pw 3654 df-sn 3675 df-pr 3676 df-op 3678 df-uni 3894 df-br 4089 df-iota 5286 df-fv 5334 |
| This theorem is referenced by: fv2prc 5678 s1prc 11199 vtxvalprc 15905 iedgvalprc 15906 |
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