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Mirrors > Home > ILE Home > Th. List > eqlei2 | GIF version |
Description: Equality implies 'less than or equal to'. (Contributed by Alexander van der Vekens, 20-Mar-2018.) |
Ref | Expression |
---|---|
lt.1 | ⊢ 𝐴 ∈ ℝ |
Ref | Expression |
---|---|
eqlei2 | ⊢ (𝐵 = 𝐴 → 𝐵 ≤ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lt.1 | . . 3 ⊢ 𝐴 ∈ ℝ | |
2 | eleq1 2240 | . . 3 ⊢ (𝐵 = 𝐴 → (𝐵 ∈ ℝ ↔ 𝐴 ∈ ℝ)) | |
3 | 1, 2 | mpbiri 168 | . 2 ⊢ (𝐵 = 𝐴 → 𝐵 ∈ ℝ) |
4 | eqle 8026 | . 2 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 = 𝐴) → 𝐵 ≤ 𝐴) | |
5 | 3, 4 | mpancom 422 | 1 ⊢ (𝐵 = 𝐴 → 𝐵 ≤ 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1353 ∈ wcel 2148 class class class wbr 4000 ℝcr 7788 ≤ cle 7970 |
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 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-sep 4118 ax-pow 4171 ax-pr 4205 ax-un 4429 ax-setind 4532 ax-cnex 7880 ax-resscn 7881 ax-pre-ltirr 7901 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-rab 2464 df-v 2739 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-pw 3576 df-sn 3597 df-pr 3598 df-op 3600 df-uni 3808 df-br 4001 df-opab 4062 df-xp 4628 df-cnv 4630 df-pnf 7971 df-mnf 7972 df-xr 7973 df-ltxr 7974 df-le 7975 |
This theorem is referenced by: sup3exmid 8890 |
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