Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > rrextchr | Structured version Visualization version GIF version |
Description: The ring characteristic of an extension of ℝ is zero. (Contributed by Thierry Arnoux, 2-May-2018.) |
Ref | Expression |
---|---|
rrextchr | ⊢ (𝑅 ∈ ℝExt → (chr‘𝑅) = 0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2622 | . . . 4 ⊢ (Base‘𝑅) = (Base‘𝑅) | |
2 | eqid 2622 | . . . 4 ⊢ ((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))) = ((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))) | |
3 | eqid 2622 | . . . 4 ⊢ (ℤMod‘𝑅) = (ℤMod‘𝑅) | |
4 | 1, 2, 3 | isrrext 30044 | . . 3 ⊢ (𝑅 ∈ ℝExt ↔ ((𝑅 ∈ NrmRing ∧ 𝑅 ∈ DivRing) ∧ ((ℤMod‘𝑅) ∈ NrmMod ∧ (chr‘𝑅) = 0) ∧ (𝑅 ∈ CUnifSp ∧ (UnifSt‘𝑅) = (metUnif‘((dist‘𝑅) ↾ ((Base‘𝑅) × (Base‘𝑅))))))) |
5 | 4 | simp2bi 1077 | . 2 ⊢ (𝑅 ∈ ℝExt → ((ℤMod‘𝑅) ∈ NrmMod ∧ (chr‘𝑅) = 0)) |
6 | 5 | simprd 479 | 1 ⊢ (𝑅 ∈ ℝExt → (chr‘𝑅) = 0) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 = wceq 1483 ∈ wcel 1990 × cxp 5112 ↾ cres 5116 ‘cfv 5888 0cc0 9936 Basecbs 15857 distcds 15950 DivRingcdr 18747 metUnifcmetu 19737 ℤModczlm 19849 chrcchr 19850 UnifStcuss 22057 CUnifSpccusp 22101 NrmRingcnrg 22384 NrmModcnlm 22385 ℝExt crrext 30038 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-xp 5120 df-res 5126 df-iota 5851 df-fv 5896 df-rrext 30043 |
This theorem is referenced by: rrhfe 30056 rrhcne 30057 rrhqima 30058 rrh0 30059 sitgclg 30404 |
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