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| Mirrors > Home > MPE Home > Th. List > neirr | Structured version Visualization version GIF version | ||
| Description: No class is unequal to itself. Inequality is irreflexive. (Contributed by Stefan O'Rear, 1-Jan-2015.) |
| Ref | Expression |
|---|---|
| neirr | ⊢ ¬ 𝐴 ≠ 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2760 | . 2 ⊢ 𝐴 = 𝐴 | |
| 2 | nne 2959 | . 2 ⊢ (¬ 𝐴 ≠ 𝐴 ↔ 𝐴 = 𝐴) | |
| 3 | 1, 2 | mpbir 234 | 1 ⊢ ¬ 𝐴 ≠ 𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 = wceq 1569 ≠ wne 2955 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1812 df-cleq 2752 df-ne 2956 |
| This theorem is used by: pssirr 4030 neldifsn 4751 frxp2 8163 poxp3 8169 frxp3 8170 ac5b 10559 0nnn 12377 1nuz2 13054 dprd2da 20263 dvlog 26984 legso 29067 hleqnid 29079 umgrnloop0 29692 usgrnloop0ALT 29791 nfrgr2v 30878 0ngrp 31118 neldifpr1 33176 neldifpr2 33177 assafld 34315 signswch 35236 signstfvneq0 35247 linedegen 37000 irrdiff 38340 prtlem400 40020 padd01 40961 padd02 40962 fiiuncl 46175 gpg5nbgrvtx03starlem1 49259 gpg5nbgrvtx03starlem2 49260 gpg5nbgrvtx03starlem3 49261 gpg5nbgrvtx13starlem1 49262 gpg5nbgrvtx13starlem2 49263 gpg5nbgrvtx13starlem3 49264 gpg5edgnedg 49321 rmsupp0 49573 lcoc0 49627 |
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