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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 5641 | . 2 ⊢ (¬ 𝐴 ∈ V → ¬ ∃!𝑥 𝐴𝐹𝑥) | |
| 2 | tz6.12-2 5639 | . 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 1398 ∃!weu 2079 ∈ wcel 2202 Vcvv 2803 ∅c0 3496 class class class wbr 4093 ‘cfv 5333 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-setind 4641 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-ral 2516 df-rex 2517 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-br 4094 df-iota 5293 df-fv 5341 |
| This theorem is referenced by: fv2prc 5687 s1prc 11249 vtxvalprc 15979 iedgvalprc 15980 |
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