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| Mirrors > Home > ILE Home > Th. List > map0 | GIF version | ||
| Description: Set exponentiation is empty iff the base is empty and the exponent is not empty. Theorem 97 of [Suppes] p. 89. (Contributed by NM, 10-Dec-2003.) |
| Ref | Expression |
|---|---|
| map0.1 | ⊢ 𝐴 ∈ V |
| map0.2 | ⊢ 𝐵 ∈ V |
| Ref | Expression |
|---|---|
| map0 | ⊢ ((𝐴 ↑𝑚 𝐵) = ∅ ↔ (𝐴 = ∅ ∧ 𝐵 ≠ ∅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | map0.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | map0.2 | . 2 ⊢ 𝐵 ∈ V | |
| 3 | map0g 6756 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ((𝐴 ↑𝑚 𝐵) = ∅ ↔ (𝐴 = ∅ ∧ 𝐵 ≠ ∅))) | |
| 4 | 1, 2, 3 | mp2an 426 | 1 ⊢ ((𝐴 ↑𝑚 𝐵) = ∅ ↔ (𝐴 = ∅ ∧ 𝐵 ≠ ∅)) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ↔ wb 105 = wceq 1364 ∈ wcel 2167 ≠ wne 2367 Vcvv 2763 ∅c0 3451 (class class class)co 5925 ↑𝑚 cmap 6716 |
| 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 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4152 ax-nul 4160 ax-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-ral 2480 df-rex 2481 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-nul 3452 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-br 4035 df-opab 4096 df-mpt 4097 df-id 4329 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-rn 4675 df-iota 5220 df-fun 5261 df-fn 5262 df-f 5263 df-fv 5267 df-ov 5928 df-oprab 5929 df-mpo 5930 df-map 6718 |
| This theorem is referenced by: (None) |
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