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| Description: Membership in the set of integers. |
| Ref | Expression |
|---|---|
| elz |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq1 1473 |
. . 3
| |
| 2 | eleq1 1526 |
. . 3
| |
| 3 | negeq 5331 |
. . . 4
| |
| 4 | 3 | eleq1d 1532 |
. . 3
|
| 5 | 1, 2, 4 | 3orbi123d 889 |
. 2
|
| 6 | df-z 6083 |
. 2
| |
| 7 | 5, 6 | elrab2 1898 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: nnnegz 6085 zret 6086 elnnz 6092 0z 6093 elznn0nn 6095 elznn0 6096 elznn 6097 elnnz1 6102 znegclt 6110 zeot 6146 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 774 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-rab 1644 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-uni 2494 df-br 2610 df-opab 2657 df-xp 3174 df-cnv 3176 df-dm 3178 df-rn 3179 df-res 3180 df-ima 3181 df-fv 3188 df-opr 3950 df-neg 5330 df-z 6083 |