Theorem grplactval 17870

Description: The value of the left group action of element 𝐴 of group 𝐺 at 𝐵. (Contributed by Paul Chapman, 18-Mar-2008.)

Hypotheses

Ref	Expression
grplact.1	⊢ 𝐹 = (𝑔 ∈ 𝑋 ↦ (𝑎 ∈ 𝑋 ↦ (𝑔 + 𝑎)))
grplact.2	⊢ 𝑋 = (Base‘𝐺)

Assertion

Ref	Expression
grplactval	⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → ((𝐹‘𝐴)‘𝐵) = (𝐴 + 𝐵))

Distinct variable groups:   𝑔,𝑎,𝐴   𝐺,𝑎,𝑔   + ,𝑎,𝑔   𝑋,𝑎,𝑔   𝐵,𝑎

Allowed substitution hints:   𝐵(𝑔)   𝐹(𝑔,𝑎)

Proof of Theorem grplactval

Step	Hyp	Ref	Expression
1		grplact.1	. . . 4 ⊢ 𝐹 = (𝑔 ∈ 𝑋 ↦ (𝑎 ∈ 𝑋 ↦ (𝑔 + 𝑎)))
2		grplact.2	. . . 4 ⊢ 𝑋 = (Base‘𝐺)
3	1, 2	grplactfval 17869	. . 3 ⊢ (𝐴 ∈ 𝑋 → (𝐹‘𝐴) = (𝑎 ∈ 𝑋 ↦ (𝐴 + 𝑎)))
4	3	fveq1d 6434	. 2 ⊢ (𝐴 ∈ 𝑋 → ((𝐹‘𝐴)‘𝐵) = ((𝑎 ∈ 𝑋 ↦ (𝐴 + 𝑎))‘𝐵))
5		oveq2 6912	. . 3 ⊢ (𝑎 = 𝐵 → (𝐴 + 𝑎) = (𝐴 + 𝐵))
6		eqid 2824	. . 3 ⊢ (𝑎 ∈ 𝑋 ↦ (𝐴 + 𝑎)) = (𝑎 ∈ 𝑋 ↦ (𝐴 + 𝑎))
7		ovex 6936	. . 3 ⊢ (𝐴 + 𝐵) ∈ V
8	5, 6, 7	fvmpt 6528	. 2 ⊢ (𝐵 ∈ 𝑋 → ((𝑎 ∈ 𝑋 ↦ (𝐴 + 𝑎))‘𝐵) = (𝐴 + 𝐵))
9	4, 8	sylan9eq 2880	1 ⊢ ((𝐴 ∈ 𝑋 ∧ 𝐵 ∈ 𝑋) → ((𝐹‘𝐴)‘𝐵) = (𝐴 + 𝐵))

Syntax hints:   → wi 4   ∧ wa 386   = wceq 1658   ∈ wcel 2166   ↦ cmpt 4951  ‘cfv 6122  (class class class)co 6904  Basecbs 16221

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1896  ax-4 1910  ax-5 2011  ax-6 2077  ax-7 2114  ax-9 2175  ax-10 2194  ax-11 2209  ax-12 2222  ax-13 2390  ax-ext 2802  ax-rep 4993  ax-sep 5004  ax-nul 5012  ax-pr 5126

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 881  df-3an 1115  df-tru 1662  df-ex 1881  df-nf 1885  df-sb 2070  df-mo 2604  df-eu 2639  df-clab 2811  df-cleq 2817  df-clel 2820  df-nfc 2957  df-ne 2999  df-ral 3121  df-rex 3122  df-reu 3123  df-rab 3125  df-v 3415  df-sbc 3662  df-csb 3757  df-dif 3800  df-un 3802  df-in 3804  df-ss 3811  df-nul 4144  df-if 4306  df-sn 4397  df-pr 4399  df-op 4403  df-uni 4658  df-iun 4741  df-br 4873  df-opab 4935  df-mpt 4952  df-id 5249  df-xp 5347  df-rel 5348  df-cnv 5349  df-co 5350  df-dm 5351  df-rn 5352  df-res 5353  df-ima 5354  df-iota 6085  df-fun 6124  df-fn 6125  df-f 6126  df-f1 6127  df-fo 6128  df-f1o 6129  df-fv 6130  df-ov 6907

This theorem is referenced by:  cayleylem2  18182  dchrsum2  25405  sumdchr2  25407