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Theorem mulgval 13625
Description: Value of the group multiple (exponentiation) operation. (Contributed by Mario Carneiro, 11-Dec-2014.)
Hypotheses
Ref Expression
mulgval.b 𝐵 = (Base‘𝐺)
mulgval.p + = (+g𝐺)
mulgval.o 0 = (0g𝐺)
mulgval.i 𝐼 = (invg𝐺)
mulgval.t · = (.g𝐺)
mulgval.s 𝑆 = seq1( + , (ℕ × {𝑋}))
Assertion
Ref Expression
mulgval ((𝑁 ∈ ℤ ∧ 𝑋𝐵) → (𝑁 · 𝑋) = if(𝑁 = 0, 0 , if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁)))))

Proof of Theorem mulgval
Dummy variables 𝑥 𝑛 𝑢 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mulgval.b . . . 4 𝐵 = (Base‘𝐺)
21basmex 13058 . . 3 (𝑋𝐵𝐺 ∈ V)
32adantl 277 . 2 ((𝑁 ∈ ℤ ∧ 𝑋𝐵) → 𝐺 ∈ V)
4 mulgval.p . . . . 5 + = (+g𝐺)
5 mulgval.o . . . . 5 0 = (0g𝐺)
6 mulgval.i . . . . 5 𝐼 = (invg𝐺)
7 mulgval.t . . . . 5 · = (.g𝐺)
81, 4, 5, 6, 7mulgfvalg 13624 . . . 4 (𝐺 ∈ V → · = (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, 0 , if(0 < 𝑛, (seq1( + , (ℕ × {𝑥}))‘𝑛), (𝐼‘(seq1( + , (ℕ × {𝑥}))‘-𝑛))))))
98adantl 277 . . 3 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → · = (𝑛 ∈ ℤ, 𝑥𝐵 ↦ if(𝑛 = 0, 0 , if(0 < 𝑛, (seq1( + , (ℕ × {𝑥}))‘𝑛), (𝐼‘(seq1( + , (ℕ × {𝑥}))‘-𝑛))))))
10 simpl 109 . . . . . 6 ((𝑛 = 𝑁𝑥 = 𝑋) → 𝑛 = 𝑁)
1110eqeq1d 2218 . . . . 5 ((𝑛 = 𝑁𝑥 = 𝑋) → (𝑛 = 0 ↔ 𝑁 = 0))
1210breq2d 4074 . . . . . 6 ((𝑛 = 𝑁𝑥 = 𝑋) → (0 < 𝑛 ↔ 0 < 𝑁))
13 simpr 110 . . . . . . . . . . 11 ((𝑛 = 𝑁𝑥 = 𝑋) → 𝑥 = 𝑋)
1413sneqd 3659 . . . . . . . . . 10 ((𝑛 = 𝑁𝑥 = 𝑋) → {𝑥} = {𝑋})
1514xpeq2d 4720 . . . . . . . . 9 ((𝑛 = 𝑁𝑥 = 𝑋) → (ℕ × {𝑥}) = (ℕ × {𝑋}))
1615seqeq3d 10644 . . . . . . . 8 ((𝑛 = 𝑁𝑥 = 𝑋) → seq1( + , (ℕ × {𝑥})) = seq1( + , (ℕ × {𝑋})))
17 mulgval.s . . . . . . . 8 𝑆 = seq1( + , (ℕ × {𝑋}))
1816, 17eqtr4di 2260 . . . . . . 7 ((𝑛 = 𝑁𝑥 = 𝑋) → seq1( + , (ℕ × {𝑥})) = 𝑆)
1918, 10fveq12d 5610 . . . . . 6 ((𝑛 = 𝑁𝑥 = 𝑋) → (seq1( + , (ℕ × {𝑥}))‘𝑛) = (𝑆𝑁))
2010negeqd 8309 . . . . . . . 8 ((𝑛 = 𝑁𝑥 = 𝑋) → -𝑛 = -𝑁)
2118, 20fveq12d 5610 . . . . . . 7 ((𝑛 = 𝑁𝑥 = 𝑋) → (seq1( + , (ℕ × {𝑥}))‘-𝑛) = (𝑆‘-𝑁))
2221fveq2d 5607 . . . . . 6 ((𝑛 = 𝑁𝑥 = 𝑋) → (𝐼‘(seq1( + , (ℕ × {𝑥}))‘-𝑛)) = (𝐼‘(𝑆‘-𝑁)))
2312, 19, 22ifbieq12d 3609 . . . . 5 ((𝑛 = 𝑁𝑥 = 𝑋) → if(0 < 𝑛, (seq1( + , (ℕ × {𝑥}))‘𝑛), (𝐼‘(seq1( + , (ℕ × {𝑥}))‘-𝑛))) = if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁))))
2411, 23ifbieq2d 3607 . . . 4 ((𝑛 = 𝑁𝑥 = 𝑋) → if(𝑛 = 0, 0 , if(0 < 𝑛, (seq1( + , (ℕ × {𝑥}))‘𝑛), (𝐼‘(seq1( + , (ℕ × {𝑥}))‘-𝑛)))) = if(𝑁 = 0, 0 , if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁)))))
2524adantl 277 . . 3 ((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ (𝑛 = 𝑁𝑥 = 𝑋)) → if(𝑛 = 0, 0 , if(0 < 𝑛, (seq1( + , (ℕ × {𝑥}))‘𝑛), (𝐼‘(seq1( + , (ℕ × {𝑥}))‘-𝑛)))) = if(𝑁 = 0, 0 , if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁)))))
26 simpll 527 . . 3 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → 𝑁 ∈ ℤ)
27 simplr 528 . . 3 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → 𝑋𝐵)
28 fn0g 13374 . . . . . . 7 0g Fn V
29 funfvex 5620 . . . . . . . 8 ((Fun 0g𝐺 ∈ dom 0g) → (0g𝐺) ∈ V)
3029funfni 5399 . . . . . . 7 ((0g Fn V ∧ 𝐺 ∈ V) → (0g𝐺) ∈ V)
3128, 30mpan 424 . . . . . 6 (𝐺 ∈ V → (0g𝐺) ∈ V)
325, 31eqeltrid 2296 . . . . 5 (𝐺 ∈ V → 0 ∈ V)
3332ad2antlr 489 . . . 4 ((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ 𝑁 = 0) → 0 ∈ V)
34 nnuz 9726 . . . . . . . . 9 ℕ = (ℤ‘1)
35 1zzd 9441 . . . . . . . . 9 ((𝑋𝐵𝐺 ∈ V) → 1 ∈ ℤ)
36 fvconst2g 5826 . . . . . . . . . . . 12 ((𝑋𝐵𝑢 ∈ ℕ) → ((ℕ × {𝑋})‘𝑢) = 𝑋)
37 simpl 109 . . . . . . . . . . . 12 ((𝑋𝐵𝑢 ∈ ℕ) → 𝑋𝐵)
3836, 37eqeltrd 2286 . . . . . . . . . . 11 ((𝑋𝐵𝑢 ∈ ℕ) → ((ℕ × {𝑋})‘𝑢) ∈ 𝐵)
3938elexd 2793 . . . . . . . . . 10 ((𝑋𝐵𝑢 ∈ ℕ) → ((ℕ × {𝑋})‘𝑢) ∈ V)
4039adantlr 477 . . . . . . . . 9 (((𝑋𝐵𝐺 ∈ V) ∧ 𝑢 ∈ ℕ) → ((ℕ × {𝑋})‘𝑢) ∈ V)
41 simprl 529 . . . . . . . . . 10 (((𝑋𝐵𝐺 ∈ V) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → 𝑢 ∈ V)
42 plusgslid 13111 . . . . . . . . . . . . 13 (+g = Slot (+g‘ndx) ∧ (+g‘ndx) ∈ ℕ)
4342slotex 13025 . . . . . . . . . . . 12 (𝐺 ∈ V → (+g𝐺) ∈ V)
444, 43eqeltrid 2296 . . . . . . . . . . 11 (𝐺 ∈ V → + ∈ V)
4544ad2antlr 489 . . . . . . . . . 10 (((𝑋𝐵𝐺 ∈ V) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → + ∈ V)
46 simprr 531 . . . . . . . . . 10 (((𝑋𝐵𝐺 ∈ V) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → 𝑣 ∈ V)
47 ovexg 6008 . . . . . . . . . 10 ((𝑢 ∈ V ∧ + ∈ V ∧ 𝑣 ∈ V) → (𝑢 + 𝑣) ∈ V)
4841, 45, 46, 47syl3anc 1252 . . . . . . . . 9 (((𝑋𝐵𝐺 ∈ V) ∧ (𝑢 ∈ V ∧ 𝑣 ∈ V)) → (𝑢 + 𝑣) ∈ V)
4934, 35, 40, 48seqf 10653 . . . . . . . 8 ((𝑋𝐵𝐺 ∈ V) → seq1( + , (ℕ × {𝑋})):ℕ⟶V)
5017feq1i 5442 . . . . . . . 8 (𝑆:ℕ⟶V ↔ seq1( + , (ℕ × {𝑋})):ℕ⟶V)
5149, 50sylibr 134 . . . . . . 7 ((𝑋𝐵𝐺 ∈ V) → 𝑆:ℕ⟶V)
5251ad5ant23 522 . . . . . 6 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ 0 < 𝑁) → 𝑆:ℕ⟶V)
53 simp-4l 541 . . . . . . 7 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ 0 < 𝑁) → 𝑁 ∈ ℤ)
54 simpr 110 . . . . . . 7 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ 0 < 𝑁) → 0 < 𝑁)
55 elnnz 9424 . . . . . . 7 (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁))
5653, 54, 55sylanbrc 417 . . . . . 6 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ 0 < 𝑁) → 𝑁 ∈ ℕ)
5752, 56ffvelcdmd 5744 . . . . 5 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ 0 < 𝑁) → (𝑆𝑁) ∈ V)
581, 6grpinvfng 13543 . . . . . . . 8 (𝐺 ∈ V → 𝐼 Fn 𝐵)
59 basfn 13057 . . . . . . . . . 10 Base Fn V
60 funfvex 5620 . . . . . . . . . . 11 ((Fun Base ∧ 𝐺 ∈ dom Base) → (Base‘𝐺) ∈ V)
6160funfni 5399 . . . . . . . . . 10 ((Base Fn V ∧ 𝐺 ∈ V) → (Base‘𝐺) ∈ V)
6259, 61mpan 424 . . . . . . . . 9 (𝐺 ∈ V → (Base‘𝐺) ∈ V)
631, 62eqeltrid 2296 . . . . . . . 8 (𝐺 ∈ V → 𝐵 ∈ V)
64 fnex 5834 . . . . . . . 8 ((𝐼 Fn 𝐵𝐵 ∈ V) → 𝐼 ∈ V)
6558, 63, 64syl2anc 411 . . . . . . 7 (𝐺 ∈ V → 𝐼 ∈ V)
6665ad3antlr 493 . . . . . 6 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → 𝐼 ∈ V)
6751ad5ant23 522 . . . . . . 7 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → 𝑆:ℕ⟶V)
68 znegcl 9445 . . . . . . . . 9 (𝑁 ∈ ℤ → -𝑁 ∈ ℤ)
6968ad4antr 494 . . . . . . . 8 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → -𝑁 ∈ ℤ)
70 simplr 528 . . . . . . . . . 10 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → ¬ 𝑁 = 0)
71 simpr 110 . . . . . . . . . 10 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → ¬ 0 < 𝑁)
72 ztri3or0 9456 . . . . . . . . . . 11 (𝑁 ∈ ℤ → (𝑁 < 0 ∨ 𝑁 = 0 ∨ 0 < 𝑁))
7372ad4antr 494 . . . . . . . . . 10 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → (𝑁 < 0 ∨ 𝑁 = 0 ∨ 0 < 𝑁))
7470, 71, 73ecase23d 1365 . . . . . . . . 9 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → 𝑁 < 0)
75 zre 9418 . . . . . . . . . . 11 (𝑁 ∈ ℤ → 𝑁 ∈ ℝ)
7675ad4antr 494 . . . . . . . . . 10 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → 𝑁 ∈ ℝ)
7776lt0neg1d 8630 . . . . . . . . 9 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → (𝑁 < 0 ↔ 0 < -𝑁))
7874, 77mpbid 147 . . . . . . . 8 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → 0 < -𝑁)
79 elnnz 9424 . . . . . . . 8 (-𝑁 ∈ ℕ ↔ (-𝑁 ∈ ℤ ∧ 0 < -𝑁))
8069, 78, 79sylanbrc 417 . . . . . . 7 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → -𝑁 ∈ ℕ)
8167, 80ffvelcdmd 5744 . . . . . 6 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → (𝑆‘-𝑁) ∈ V)
82 fvexg 5622 . . . . . 6 ((𝐼 ∈ V ∧ (𝑆‘-𝑁) ∈ V) → (𝐼‘(𝑆‘-𝑁)) ∈ V)
8366, 81, 82syl2anc 411 . . . . 5 (((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) ∧ ¬ 0 < 𝑁) → (𝐼‘(𝑆‘-𝑁)) ∈ V)
84 0zd 9426 . . . . . 6 ((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) → 0 ∈ ℤ)
85 simplll 533 . . . . . 6 ((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) → 𝑁 ∈ ℤ)
86 zdclt 9492 . . . . . 6 ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → DECID 0 < 𝑁)
8784, 85, 86syl2anc 411 . . . . 5 ((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) → DECID 0 < 𝑁)
8857, 83, 87ifcldadc 3612 . . . 4 ((((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) ∧ ¬ 𝑁 = 0) → if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁))) ∈ V)
89 0zd 9426 . . . . 5 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → 0 ∈ ℤ)
90 zdceq 9490 . . . . 5 ((𝑁 ∈ ℤ ∧ 0 ∈ ℤ) → DECID 𝑁 = 0)
9126, 89, 90syl2anc 411 . . . 4 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → DECID 𝑁 = 0)
9233, 88, 91ifcldadc 3612 . . 3 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → if(𝑁 = 0, 0 , if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁)))) ∈ V)
939, 25, 26, 27, 92ovmpod 6103 . 2 (((𝑁 ∈ ℤ ∧ 𝑋𝐵) ∧ 𝐺 ∈ V) → (𝑁 · 𝑋) = if(𝑁 = 0, 0 , if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁)))))
943, 93mpdan 421 1 ((𝑁 ∈ ℤ ∧ 𝑋𝐵) → (𝑁 · 𝑋) = if(𝑁 = 0, 0 , if(0 < 𝑁, (𝑆𝑁), (𝐼‘(𝑆‘-𝑁)))))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 104  DECID wdc 838  w3o 982   = wceq 1375  wcel 2180  Vcvv 2779  ifcif 3582  {csn 3646   class class class wbr 4062   × cxp 4694   Fn wfn 5289  wf 5290  cfv 5294  (class class class)co 5974  cmpo 5976  cr 7966  0cc0 7967  1c1 7968   < clt 8149  -cneg 8286  cn 9078  cz 9414  seqcseq 10636  Basecbs 12998  +gcplusg 13076  0gc0g 13255  invgcminusg 13500  .gcmg 13622
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 617  ax-in2 618  ax-io 713  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ie1 1519  ax-ie2 1520  ax-8 1530  ax-10 1531  ax-11 1532  ax-i12 1533  ax-bndl 1535  ax-4 1536  ax-17 1552  ax-i9 1556  ax-ial 1560  ax-i5r 1561  ax-13 2182  ax-14 2183  ax-ext 2191  ax-coll 4178  ax-sep 4181  ax-nul 4189  ax-pow 4237  ax-pr 4272  ax-un 4501  ax-setind 4606  ax-iinf 4657  ax-cnex 8058  ax-resscn 8059  ax-1cn 8060  ax-1re 8061  ax-icn 8062  ax-addcl 8063  ax-addrcl 8064  ax-mulcl 8065  ax-addcom 8067  ax-addass 8069  ax-distr 8071  ax-i2m1 8072  ax-0lt1 8073  ax-0id 8075  ax-rnegex 8076  ax-cnre 8078  ax-pre-ltirr 8079  ax-pre-ltwlin 8080  ax-pre-lttrn 8081  ax-pre-ltadd 8083
This theorem depends on definitions:  df-bi 117  df-dc 839  df-3or 984  df-3an 985  df-tru 1378  df-fal 1381  df-nf 1487  df-sb 1789  df-eu 2060  df-mo 2061  df-clab 2196  df-cleq 2202  df-clel 2205  df-nfc 2341  df-ne 2381  df-nel 2476  df-ral 2493  df-rex 2494  df-reu 2495  df-rab 2497  df-v 2781  df-sbc 3009  df-csb 3105  df-dif 3179  df-un 3181  df-in 3183  df-ss 3190  df-nul 3472  df-if 3583  df-pw 3631  df-sn 3652  df-pr 3653  df-op 3655  df-uni 3868  df-int 3903  df-iun 3946  df-br 4063  df-opab 4125  df-mpt 4126  df-tr 4162  df-id 4361  df-iord 4434  df-on 4436  df-ilim 4437  df-suc 4439  df-iom 4660  df-xp 4702  df-rel 4703  df-cnv 4704  df-co 4705  df-dm 4706  df-rn 4707  df-res 4708  df-ima 4709  df-iota 5254  df-fun 5296  df-fn 5297  df-f 5298  df-f1 5299  df-fo 5300  df-f1o 5301  df-fv 5302  df-riota 5927  df-ov 5977  df-oprab 5978  df-mpo 5979  df-1st 6256  df-2nd 6257  df-recs 6421  df-frec 6507  df-pnf 8151  df-mnf 8152  df-xr 8153  df-ltxr 8154  df-le 8155  df-sub 8287  df-neg 8288  df-inn 9079  df-2 9137  df-n0 9338  df-z 9415  df-uz 9691  df-seqfrec 10637  df-ndx 13001  df-slot 13002  df-base 13004  df-plusg 13089  df-0g 13257  df-minusg 13503  df-mulg 13623
This theorem is referenced by:  mulg0  13628  mulgnn  13629  mulgnegnn  13635  subgmulg  13691
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