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Theorem idlmhm 21057
Description: The identity function on a module is linear. (Contributed by Stefan O'Rear, 4-Sep-2015.)
Hypothesis
Ref Expression
idlmhm.b 𝐵 = (Base‘𝑀)
Assertion
Ref Expression
idlmhm (𝑀 ∈ LMod → ( I ↾ 𝐵) ∈ (𝑀 LMHom 𝑀))

Proof of Theorem idlmhm
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 idlmhm.b . 2 𝐵 = (Base‘𝑀)
2 eqid 2734 . 2 ( ·𝑠𝑀) = ( ·𝑠𝑀)
3 eqid 2734 . 2 (Scalar‘𝑀) = (Scalar‘𝑀)
4 eqid 2734 . 2 (Base‘(Scalar‘𝑀)) = (Base‘(Scalar‘𝑀))
5 id 22 . 2 (𝑀 ∈ LMod → 𝑀 ∈ LMod)
6 eqidd 2735 . 2 (𝑀 ∈ LMod → (Scalar‘𝑀) = (Scalar‘𝑀))
7 lmodgrp 20881 . . 3 (𝑀 ∈ LMod → 𝑀 ∈ Grp)
81idghm 19261 . . 3 (𝑀 ∈ Grp → ( I ↾ 𝐵) ∈ (𝑀 GrpHom 𝑀))
97, 8syl 17 . 2 (𝑀 ∈ LMod → ( I ↾ 𝐵) ∈ (𝑀 GrpHom 𝑀))
101, 3, 2, 4lmodvscl 20892 . . . . 5 ((𝑀 ∈ LMod ∧ 𝑥 ∈ (Base‘(Scalar‘𝑀)) ∧ 𝑦𝐵) → (𝑥( ·𝑠𝑀)𝑦) ∈ 𝐵)
11103expb 1119 . . . 4 ((𝑀 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑀)) ∧ 𝑦𝐵)) → (𝑥( ·𝑠𝑀)𝑦) ∈ 𝐵)
12 fvresi 7192 . . . 4 ((𝑥( ·𝑠𝑀)𝑦) ∈ 𝐵 → (( I ↾ 𝐵)‘(𝑥( ·𝑠𝑀)𝑦)) = (𝑥( ·𝑠𝑀)𝑦))
1311, 12syl 17 . . 3 ((𝑀 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑀)) ∧ 𝑦𝐵)) → (( I ↾ 𝐵)‘(𝑥( ·𝑠𝑀)𝑦)) = (𝑥( ·𝑠𝑀)𝑦))
14 fvresi 7192 . . . . 5 (𝑦𝐵 → (( I ↾ 𝐵)‘𝑦) = 𝑦)
1514ad2antll 729 . . . 4 ((𝑀 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑀)) ∧ 𝑦𝐵)) → (( I ↾ 𝐵)‘𝑦) = 𝑦)
1615oveq2d 7446 . . 3 ((𝑀 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑀)) ∧ 𝑦𝐵)) → (𝑥( ·𝑠𝑀)(( I ↾ 𝐵)‘𝑦)) = (𝑥( ·𝑠𝑀)𝑦))
1713, 16eqtr4d 2777 . 2 ((𝑀 ∈ LMod ∧ (𝑥 ∈ (Base‘(Scalar‘𝑀)) ∧ 𝑦𝐵)) → (( I ↾ 𝐵)‘(𝑥( ·𝑠𝑀)𝑦)) = (𝑥( ·𝑠𝑀)(( I ↾ 𝐵)‘𝑦)))
181, 2, 2, 3, 3, 4, 5, 5, 6, 9, 17islmhmd 21055 1 (𝑀 ∈ LMod → ( I ↾ 𝐵) ∈ (𝑀 LMHom 𝑀))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1536  wcel 2105   I cid 5581  cres 5690  cfv 6562  (class class class)co 7430  Basecbs 17244  Scalarcsca 17300   ·𝑠 cvsca 17301  Grpcgrp 18963   GrpHom cghm 19242  LModclmod 20874   LMHom clmhm 21035
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1791  ax-4 1805  ax-5 1907  ax-6 1964  ax-7 2004  ax-8 2107  ax-9 2115  ax-10 2138  ax-11 2154  ax-12 2174  ax-ext 2705  ax-sep 5301  ax-nul 5311  ax-pow 5370  ax-pr 5437  ax-un 7753
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1539  df-fal 1549  df-ex 1776  df-nf 1780  df-sb 2062  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2726  df-clel 2813  df-nfc 2889  df-ne 2938  df-ral 3059  df-rex 3068  df-rab 3433  df-v 3479  df-sbc 3791  df-csb 3908  df-dif 3965  df-un 3967  df-in 3969  df-ss 3979  df-nul 4339  df-if 4531  df-pw 4606  df-sn 4631  df-pr 4633  df-op 4637  df-uni 4912  df-iun 4997  df-br 5148  df-opab 5210  df-mpt 5231  df-id 5582  df-xp 5694  df-rel 5695  df-cnv 5696  df-co 5697  df-dm 5698  df-rn 5699  df-res 5700  df-ima 5701  df-iota 6515  df-fun 6564  df-fn 6565  df-f 6566  df-f1 6567  df-fo 6568  df-f1o 6569  df-fv 6570  df-ov 7433  df-oprab 7434  df-mpo 7435  df-1st 8012  df-2nd 8013  df-map 8866  df-mgm 18665  df-sgrp 18744  df-mnd 18760  df-grp 18966  df-ghm 19243  df-lmod 20876  df-lmhm 21038
This theorem is referenced by:  idnmhm  24790  mendring  43176
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