Metamath Proof Explorer


Theorem mdetfval

Description: First substitution for the determinant definition. (Contributed by Stefan O'Rear, 9-Sep-2015) (Revised by SO, 9-Jul-2018)

Ref Expression
Hypotheses mdetfval.d 𝐷 = ( 𝑁 maDet 𝑅 )
mdetfval.a 𝐴 = ( 𝑁 Mat 𝑅 )
mdetfval.b 𝐵 = ( Base ‘ 𝐴 )
mdetfval.p 𝑃 = ( Base ‘ ( SymGrp ‘ 𝑁 ) )
mdetfval.y 𝑌 = ( ℤRHom ‘ 𝑅 )
mdetfval.s 𝑆 = ( pmSgn ‘ 𝑁 )
mdetfval.t · = ( .r𝑅 )
mdetfval.u 𝑈 = ( mulGrp ‘ 𝑅 )
Assertion mdetfval 𝐷 = ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) )

Proof

Step Hyp Ref Expression
1 mdetfval.d 𝐷 = ( 𝑁 maDet 𝑅 )
2 mdetfval.a 𝐴 = ( 𝑁 Mat 𝑅 )
3 mdetfval.b 𝐵 = ( Base ‘ 𝐴 )
4 mdetfval.p 𝑃 = ( Base ‘ ( SymGrp ‘ 𝑁 ) )
5 mdetfval.y 𝑌 = ( ℤRHom ‘ 𝑅 )
6 mdetfval.s 𝑆 = ( pmSgn ‘ 𝑁 )
7 mdetfval.t · = ( .r𝑅 )
8 mdetfval.u 𝑈 = ( mulGrp ‘ 𝑅 )
9 oveq12 ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( 𝑛 Mat 𝑟 ) = ( 𝑁 Mat 𝑅 ) )
10 9 2 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( 𝑛 Mat 𝑟 ) = 𝐴 )
11 10 fveq2d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( Base ‘ ( 𝑛 Mat 𝑟 ) ) = ( Base ‘ 𝐴 ) )
12 11 3 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( Base ‘ ( 𝑛 Mat 𝑟 ) ) = 𝐵 )
13 simpr ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → 𝑟 = 𝑅 )
14 simpl ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → 𝑛 = 𝑁 )
15 14 fveq2d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( SymGrp ‘ 𝑛 ) = ( SymGrp ‘ 𝑁 ) )
16 15 fveq2d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( Base ‘ ( SymGrp ‘ 𝑛 ) ) = ( Base ‘ ( SymGrp ‘ 𝑁 ) ) )
17 16 4 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( Base ‘ ( SymGrp ‘ 𝑛 ) ) = 𝑃 )
18 fveq2 ( 𝑟 = 𝑅 → ( .r𝑟 ) = ( .r𝑅 ) )
19 18 adantl ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( .r𝑟 ) = ( .r𝑅 ) )
20 19 7 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( .r𝑟 ) = · )
21 13 fveq2d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( ℤRHom ‘ 𝑟 ) = ( ℤRHom ‘ 𝑅 ) )
22 21 5 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( ℤRHom ‘ 𝑟 ) = 𝑌 )
23 fveq2 ( 𝑛 = 𝑁 → ( pmSgn ‘ 𝑛 ) = ( pmSgn ‘ 𝑁 ) )
24 23 adantr ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( pmSgn ‘ 𝑛 ) = ( pmSgn ‘ 𝑁 ) )
25 24 6 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( pmSgn ‘ 𝑛 ) = 𝑆 )
26 22 25 coeq12d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) = ( 𝑌𝑆 ) )
27 26 fveq1d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) ‘ 𝑝 ) = ( ( 𝑌𝑆 ) ‘ 𝑝 ) )
28 fveq2 ( 𝑟 = 𝑅 → ( mulGrp ‘ 𝑟 ) = ( mulGrp ‘ 𝑅 ) )
29 28 adantl ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( mulGrp ‘ 𝑟 ) = ( mulGrp ‘ 𝑅 ) )
30 29 8 eqtr4di ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( mulGrp ‘ 𝑟 ) = 𝑈 )
31 14 mpteq1d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) = ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) )
32 30 31 oveq12d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( ( mulGrp ‘ 𝑟 ) Σg ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) = ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) )
33 20 27 32 oveq123d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( ( ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) ‘ 𝑝 ) ( .r𝑟 ) ( ( mulGrp ‘ 𝑟 ) Σg ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) = ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) )
34 17 33 mpteq12dv ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( 𝑝 ∈ ( Base ‘ ( SymGrp ‘ 𝑛 ) ) ↦ ( ( ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) ‘ 𝑝 ) ( .r𝑟 ) ( ( mulGrp ‘ 𝑟 ) Σg ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) = ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) )
35 13 34 oveq12d ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( 𝑟 Σg ( 𝑝 ∈ ( Base ‘ ( SymGrp ‘ 𝑛 ) ) ↦ ( ( ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) ‘ 𝑝 ) ( .r𝑟 ) ( ( mulGrp ‘ 𝑟 ) Σg ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) = ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) )
36 12 35 mpteq12dv ( ( 𝑛 = 𝑁𝑟 = 𝑅 ) → ( 𝑚 ∈ ( Base ‘ ( 𝑛 Mat 𝑟 ) ) ↦ ( 𝑟 Σg ( 𝑝 ∈ ( Base ‘ ( SymGrp ‘ 𝑛 ) ) ↦ ( ( ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) ‘ 𝑝 ) ( .r𝑟 ) ( ( mulGrp ‘ 𝑟 ) Σg ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) = ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) )
37 df-mdet maDet = ( 𝑛 ∈ V , 𝑟 ∈ V ↦ ( 𝑚 ∈ ( Base ‘ ( 𝑛 Mat 𝑟 ) ) ↦ ( 𝑟 Σg ( 𝑝 ∈ ( Base ‘ ( SymGrp ‘ 𝑛 ) ) ↦ ( ( ( ( ℤRHom ‘ 𝑟 ) ∘ ( pmSgn ‘ 𝑛 ) ) ‘ 𝑝 ) ( .r𝑟 ) ( ( mulGrp ‘ 𝑟 ) Σg ( 𝑥𝑛 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) )
38 3 fvexi 𝐵 ∈ V
39 38 mptex ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) ∈ V
40 36 37 39 ovmpoa ( ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( 𝑁 maDet 𝑅 ) = ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) )
41 37 reldmmpo Rel dom maDet
42 41 ovprc ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( 𝑁 maDet 𝑅 ) = ∅ )
43 mpt0 ( 𝑚 ∈ ∅ ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) = ∅
44 42 43 eqtr4di ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( 𝑁 maDet 𝑅 ) = ( 𝑚 ∈ ∅ ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) )
45 df-mat Mat = ( 𝑦 ∈ Fin , 𝑧 ∈ V ↦ ( ( 𝑧 freeLMod ( 𝑦 × 𝑦 ) ) sSet ⟨ ( .r ‘ ndx ) , ( 𝑧 maMul ⟨ 𝑦 , 𝑦 , 𝑦 ⟩ ) ⟩ ) )
46 45 reldmmpo Rel dom Mat
47 46 ovprc ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( 𝑁 Mat 𝑅 ) = ∅ )
48 2 47 syl5eq ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → 𝐴 = ∅ )
49 48 fveq2d ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( Base ‘ 𝐴 ) = ( Base ‘ ∅ ) )
50 base0 ∅ = ( Base ‘ ∅ )
51 49 3 50 3eqtr4g ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → 𝐵 = ∅ )
52 51 mpteq1d ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) = ( 𝑚 ∈ ∅ ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) )
53 44 52 eqtr4d ( ¬ ( 𝑁 ∈ V ∧ 𝑅 ∈ V ) → ( 𝑁 maDet 𝑅 ) = ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) ) )
54 40 53 pm2.61i ( 𝑁 maDet 𝑅 ) = ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) )
55 1 54 eqtri 𝐷 = ( 𝑚𝐵 ↦ ( 𝑅 Σg ( 𝑝𝑃 ↦ ( ( ( 𝑌𝑆 ) ‘ 𝑝 ) · ( 𝑈 Σg ( 𝑥𝑁 ↦ ( ( 𝑝𝑥 ) 𝑚 𝑥 ) ) ) ) ) ) )