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| Mirrors > Home > ILE Home > Th. List > apne | GIF version | ||
| Description: Apartness implies negated equality. We cannot in general prove the converse (as shown at neapmkv 15741), which is the whole point of having separate notations for apartness and negated equality. (Contributed by Jim Kingdon, 21-Feb-2020.) |
| Ref | Expression |
|---|---|
| apne | ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 # 𝐵 → 𝐴 ≠ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | apti 8652 | . . 3 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 = 𝐵 ↔ ¬ 𝐴 # 𝐵)) | |
| 2 | 1 | biimpd 144 | . 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 = 𝐵 → ¬ 𝐴 # 𝐵)) |
| 3 | 2 | necon2ad 2424 | 1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 # 𝐵 → 𝐴 ≠ 𝐵)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 104 = wceq 1364 ∈ wcel 2167 ≠ wne 2367 class class class wbr 4034 ℂcc 7880 # cap 8611 |
| 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-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 ax-cnex 7973 ax-resscn 7974 ax-1cn 7975 ax-1re 7976 ax-icn 7977 ax-addcl 7978 ax-addrcl 7979 ax-mulcl 7980 ax-mulrcl 7981 ax-addcom 7982 ax-mulcom 7983 ax-addass 7984 ax-mulass 7985 ax-distr 7986 ax-i2m1 7987 ax-0lt1 7988 ax-1rid 7989 ax-0id 7990 ax-rnegex 7991 ax-precex 7992 ax-cnre 7993 ax-pre-ltirr 7994 ax-pre-lttrn 7996 ax-pre-apti 7997 ax-pre-ltadd 7998 ax-pre-mulgt0 7999 |
| 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-nel 2463 df-ral 2480 df-rex 2481 df-reu 2482 df-rab 2484 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-br 4035 df-opab 4096 df-id 4329 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-iota 5220 df-fun 5261 df-fv 5267 df-riota 5878 df-ov 5926 df-oprab 5927 df-mpo 5928 df-pnf 8066 df-mnf 8067 df-ltxr 8069 df-sub 8202 df-neg 8203 df-reap 8605 df-ap 8612 |
| This theorem is referenced by: divvalap 8704 2muline0 9219 zapne 9403 abssubne0 11259 tanvalap 11876 rplogbval 15207 refeq 15701 |
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