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Theorem scutun12 27319
Description: Union law for surreal cuts. (Contributed by Scott Fenton, 9-Dec-2021.)
Assertion
Ref Expression
scutun12 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ((𝐴𝐶) |s (𝐵𝐷)) = (𝐴 |s 𝐵))

Proof of Theorem scutun12
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simp1 1136 . . . . . . 7 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → 𝐴 <<s 𝐵)
2 scutcut 27310 . . . . . . 7 (𝐴 <<s 𝐵 → ((𝐴 |s 𝐵) ∈ No 𝐴 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐵))
31, 2syl 17 . . . . . 6 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ((𝐴 |s 𝐵) ∈ No 𝐴 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐵))
43simp2d 1143 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → 𝐴 <<s {(𝐴 |s 𝐵)})
5 simp2 1137 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → 𝐶 <<s {(𝐴 |s 𝐵)})
6 ssltun1 27317 . . . . 5 ((𝐴 <<s {(𝐴 |s 𝐵)} ∧ 𝐶 <<s {(𝐴 |s 𝐵)}) → (𝐴𝐶) <<s {(𝐴 |s 𝐵)})
74, 5, 6syl2anc 584 . . . 4 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝐴𝐶) <<s {(𝐴 |s 𝐵)})
83simp3d 1144 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → {(𝐴 |s 𝐵)} <<s 𝐵)
9 simp3 1138 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → {(𝐴 |s 𝐵)} <<s 𝐷)
10 ssltun2 27318 . . . . 5 (({(𝐴 |s 𝐵)} <<s 𝐵 ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → {(𝐴 |s 𝐵)} <<s (𝐵𝐷))
118, 9, 10syl2anc 584 . . . 4 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → {(𝐴 |s 𝐵)} <<s (𝐵𝐷))
12 ovex 7444 . . . . . 6 (𝐴 |s 𝐵) ∈ V
1312snnz 4780 . . . . 5 {(𝐴 |s 𝐵)} ≠ ∅
14 sslttr 27316 . . . . 5 (((𝐴𝐶) <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s (𝐵𝐷) ∧ {(𝐴 |s 𝐵)} ≠ ∅) → (𝐴𝐶) <<s (𝐵𝐷))
1513, 14mp3an3 1450 . . . 4 (((𝐴𝐶) <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s (𝐵𝐷)) → (𝐴𝐶) <<s (𝐵𝐷))
167, 11, 15syl2anc 584 . . 3 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝐴𝐶) <<s (𝐵𝐷))
17 scutval 27309 . . 3 ((𝐴𝐶) <<s (𝐵𝐷) → ((𝐴𝐶) |s (𝐵𝐷)) = (𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})))
1816, 17syl 17 . 2 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ((𝐴𝐶) |s (𝐵𝐷)) = (𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})))
19 vex 3478 . . . . . . . . . 10 𝑥 ∈ V
2019elima 6064 . . . . . . . . 9 (𝑥 ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ↔ ∃𝑧 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}𝑧 bday 𝑥)
21 sneq 4638 . . . . . . . . . . . 12 (𝑦 = 𝑧 → {𝑦} = {𝑧})
2221breq2d 5160 . . . . . . . . . . 11 (𝑦 = 𝑧 → ((𝐴𝐶) <<s {𝑦} ↔ (𝐴𝐶) <<s {𝑧}))
2321breq1d 5158 . . . . . . . . . . 11 (𝑦 = 𝑧 → ({𝑦} <<s (𝐵𝐷) ↔ {𝑧} <<s (𝐵𝐷)))
2422, 23anbi12d 631 . . . . . . . . . 10 (𝑦 = 𝑧 → (((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷)) ↔ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))))
2524rexrab 3692 . . . . . . . . 9 (∃𝑧 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}𝑧 bday 𝑥 ↔ ∃𝑧 No (((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷)) ∧ 𝑧 bday 𝑥))
2620, 25bitri 274 . . . . . . . 8 (𝑥 ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ↔ ∃𝑧 No (((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷)) ∧ 𝑧 bday 𝑥))
27 simplr 767 . . . . . . . . . . . . 13 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → 𝑧 No )
28 bdayfn 27282 . . . . . . . . . . . . . 14 bday Fn No
29 fnbrfvb 6944 . . . . . . . . . . . . . 14 (( bday Fn No 𝑧 No ) → (( bday 𝑧) = 𝑥𝑧 bday 𝑥))
3028, 29mpan 688 . . . . . . . . . . . . 13 (𝑧 No → (( bday 𝑧) = 𝑥𝑧 bday 𝑥))
3127, 30syl 17 . . . . . . . . . . . 12 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → (( bday 𝑧) = 𝑥𝑧 bday 𝑥))
32 simpll1 1212 . . . . . . . . . . . . . . 15 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → 𝐴 <<s 𝐵)
33 scutbday 27313 . . . . . . . . . . . . . . 15 (𝐴 <<s 𝐵 → ( bday ‘(𝐴 |s 𝐵)) = ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}))
3432, 33syl 17 . . . . . . . . . . . . . 14 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → ( bday ‘(𝐴 |s 𝐵)) = ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}))
35 simprl 769 . . . . . . . . . . . . . . . . . . 19 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → (𝐴𝐶) <<s {𝑧})
36 ssun1 4172 . . . . . . . . . . . . . . . . . . . 20 𝐴 ⊆ (𝐴𝐶)
37 sssslt1 27304 . . . . . . . . . . . . . . . . . . . 20 (((𝐴𝐶) <<s {𝑧} ∧ 𝐴 ⊆ (𝐴𝐶)) → 𝐴 <<s {𝑧})
3836, 37mpan2 689 . . . . . . . . . . . . . . . . . . 19 ((𝐴𝐶) <<s {𝑧} → 𝐴 <<s {𝑧})
3935, 38syl 17 . . . . . . . . . . . . . . . . . 18 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → 𝐴 <<s {𝑧})
40 simprr 771 . . . . . . . . . . . . . . . . . . 19 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → {𝑧} <<s (𝐵𝐷))
41 ssun1 4172 . . . . . . . . . . . . . . . . . . . 20 𝐵 ⊆ (𝐵𝐷)
42 sssslt2 27305 . . . . . . . . . . . . . . . . . . . 20 (({𝑧} <<s (𝐵𝐷) ∧ 𝐵 ⊆ (𝐵𝐷)) → {𝑧} <<s 𝐵)
4341, 42mpan2 689 . . . . . . . . . . . . . . . . . . 19 ({𝑧} <<s (𝐵𝐷) → {𝑧} <<s 𝐵)
4440, 43syl 17 . . . . . . . . . . . . . . . . . 18 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → {𝑧} <<s 𝐵)
4539, 44jca 512 . . . . . . . . . . . . . . . . 17 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → (𝐴 <<s {𝑧} ∧ {𝑧} <<s 𝐵))
4621breq2d 5160 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑧 → (𝐴 <<s {𝑦} ↔ 𝐴 <<s {𝑧}))
4721breq1d 5158 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑧 → ({𝑦} <<s 𝐵 ↔ {𝑧} <<s 𝐵))
4846, 47anbi12d 631 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑧 → ((𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵) ↔ (𝐴 <<s {𝑧} ∧ {𝑧} <<s 𝐵)))
4948elrab 3683 . . . . . . . . . . . . . . . . 17 (𝑧 ∈ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)} ↔ (𝑧 No ∧ (𝐴 <<s {𝑧} ∧ {𝑧} <<s 𝐵)))
5027, 45, 49sylanbrc 583 . . . . . . . . . . . . . . . 16 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → 𝑧 ∈ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)})
51 ssrab2 4077 . . . . . . . . . . . . . . . . 17 {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)} ⊆ No
52 fnfvima 7237 . . . . . . . . . . . . . . . . 17 (( bday Fn No ∧ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)} ⊆ No 𝑧 ∈ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}) → ( bday 𝑧) ∈ ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}))
5328, 51, 52mp3an12 1451 . . . . . . . . . . . . . . . 16 (𝑧 ∈ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)} → ( bday 𝑧) ∈ ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}))
5450, 53syl 17 . . . . . . . . . . . . . . 15 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → ( bday 𝑧) ∈ ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}))
55 intss1 4967 . . . . . . . . . . . . . . 15 (( bday 𝑧) ∈ ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}) → ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}) ⊆ ( bday 𝑧))
5654, 55syl 17 . . . . . . . . . . . . . 14 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → ( bday “ {𝑦 No ∣ (𝐴 <<s {𝑦} ∧ {𝑦} <<s 𝐵)}) ⊆ ( bday 𝑧))
5734, 56eqsstrd 4020 . . . . . . . . . . . . 13 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → ( bday ‘(𝐴 |s 𝐵)) ⊆ ( bday 𝑧))
58 sseq2 4008 . . . . . . . . . . . . . . 15 (( bday 𝑧) = 𝑥 → (( bday ‘(𝐴 |s 𝐵)) ⊆ ( bday 𝑧) ↔ ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
5958biimpd 228 . . . . . . . . . . . . . 14 (( bday 𝑧) = 𝑥 → (( bday ‘(𝐴 |s 𝐵)) ⊆ ( bday 𝑧) → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6059com12 32 . . . . . . . . . . . . 13 (( bday ‘(𝐴 |s 𝐵)) ⊆ ( bday 𝑧) → (( bday 𝑧) = 𝑥 → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6157, 60syl 17 . . . . . . . . . . . 12 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → (( bday 𝑧) = 𝑥 → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6231, 61sylbird 259 . . . . . . . . . . 11 ((((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) ∧ ((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷))) → (𝑧 bday 𝑥 → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6362ex 413 . . . . . . . . . 10 (((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) → (((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷)) → (𝑧 bday 𝑥 → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥)))
6463impd 411 . . . . . . . . 9 (((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) ∧ 𝑧 No ) → ((((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷)) ∧ 𝑧 bday 𝑥) → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6564rexlimdva 3155 . . . . . . . 8 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (∃𝑧 No (((𝐴𝐶) <<s {𝑧} ∧ {𝑧} <<s (𝐵𝐷)) ∧ 𝑧 bday 𝑥) → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6626, 65biimtrid 241 . . . . . . 7 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝑥 ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) → ( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥))
6766ralrimiv 3145 . . . . . 6 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ∀𝑥 ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥)
68 ssint 4968 . . . . . 6 (( bday ‘(𝐴 |s 𝐵)) ⊆ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ↔ ∀𝑥 ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})( bday ‘(𝐴 |s 𝐵)) ⊆ 𝑥)
6967, 68sylibr 233 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ( bday ‘(𝐴 |s 𝐵)) ⊆ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
703simp1d 1142 . . . . . . . 8 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝐴 |s 𝐵) ∈ No )
717, 11jca 512 . . . . . . . 8 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ((𝐴𝐶) <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s (𝐵𝐷)))
72 sneq 4638 . . . . . . . . . . 11 (𝑦 = (𝐴 |s 𝐵) → {𝑦} = {(𝐴 |s 𝐵)})
7372breq2d 5160 . . . . . . . . . 10 (𝑦 = (𝐴 |s 𝐵) → ((𝐴𝐶) <<s {𝑦} ↔ (𝐴𝐶) <<s {(𝐴 |s 𝐵)}))
7472breq1d 5158 . . . . . . . . . 10 (𝑦 = (𝐴 |s 𝐵) → ({𝑦} <<s (𝐵𝐷) ↔ {(𝐴 |s 𝐵)} <<s (𝐵𝐷)))
7573, 74anbi12d 631 . . . . . . . . 9 (𝑦 = (𝐴 |s 𝐵) → (((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷)) ↔ ((𝐴𝐶) <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s (𝐵𝐷))))
7675elrab 3683 . . . . . . . 8 ((𝐴 |s 𝐵) ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ↔ ((𝐴 |s 𝐵) ∈ No ∧ ((𝐴𝐶) <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s (𝐵𝐷))))
7770, 71, 76sylanbrc 583 . . . . . . 7 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝐴 |s 𝐵) ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})
78 ssrab2 4077 . . . . . . . 8 {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ⊆ No
79 fnfvima 7237 . . . . . . . 8 (( bday Fn No ∧ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ⊆ No ∧ (𝐴 |s 𝐵) ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) → ( bday ‘(𝐴 |s 𝐵)) ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
8028, 78, 79mp3an12 1451 . . . . . . 7 ((𝐴 |s 𝐵) ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} → ( bday ‘(𝐴 |s 𝐵)) ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
8177, 80syl 17 . . . . . 6 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ( bday ‘(𝐴 |s 𝐵)) ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
82 intss1 4967 . . . . . 6 (( bday ‘(𝐴 |s 𝐵)) ∈ ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) → ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ⊆ ( bday ‘(𝐴 |s 𝐵)))
8381, 82syl 17 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ⊆ ( bday ‘(𝐴 |s 𝐵)))
8469, 83eqssd 3999 . . . 4 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ( bday ‘(𝐴 |s 𝐵)) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
85 conway 27308 . . . . . 6 ((𝐴𝐶) <<s (𝐵𝐷) → ∃!𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
8616, 85syl 17 . . . . 5 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ∃!𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}))
87 fveqeq2 6900 . . . . . 6 (𝑥 = (𝐴 |s 𝐵) → (( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ↔ ( bday ‘(𝐴 |s 𝐵)) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})))
8887riota2 7393 . . . . 5 (((𝐴 |s 𝐵) ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ∧ ∃!𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})) → (( bday ‘(𝐴 |s 𝐵)) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ↔ (𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})) = (𝐴 |s 𝐵)))
8977, 86, 88syl2anc 584 . . . 4 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (( bday ‘(𝐴 |s 𝐵)) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))}) ↔ (𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})) = (𝐴 |s 𝐵)))
9084, 89mpbid 231 . . 3 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})) = (𝐴 |s 𝐵))
9190eqcomd 2738 . 2 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → (𝐴 |s 𝐵) = (𝑥 ∈ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))} ( bday 𝑥) = ( bday “ {𝑦 No ∣ ((𝐴𝐶) <<s {𝑦} ∧ {𝑦} <<s (𝐵𝐷))})))
9218, 91eqtr4d 2775 1 ((𝐴 <<s 𝐵𝐶 <<s {(𝐴 |s 𝐵)} ∧ {(𝐴 |s 𝐵)} <<s 𝐷) → ((𝐴𝐶) |s (𝐵𝐷)) = (𝐴 |s 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 396  w3a 1087   = wceq 1541  wcel 2106  wne 2940  wral 3061  wrex 3070  ∃!wreu 3374  {crab 3432  cun 3946  wss 3948  c0 4322  {csn 4628   cint 4950   class class class wbr 5148  cima 5679   Fn wfn 6538  cfv 6543  crio 7366  (class class class)co 7411   No csur 27150   bday cbday 27152   <<s csslt 27289   |s cscut 27291
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-rep 5285  ax-sep 5299  ax-nul 5306  ax-pr 5427  ax-un 7727
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rmo 3376  df-reu 3377  df-rab 3433  df-v 3476  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-pss 3967  df-nul 4323  df-if 4529  df-pw 4604  df-sn 4629  df-pr 4631  df-tp 4633  df-op 4635  df-uni 4909  df-int 4951  df-iun 4999  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5574  df-eprel 5580  df-po 5588  df-so 5589  df-fr 5631  df-we 5633  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-ima 5689  df-ord 6367  df-on 6368  df-suc 6370  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-riota 7367  df-ov 7414  df-oprab 7415  df-mpo 7416  df-1o 8468  df-2o 8469  df-no 27153  df-slt 27154  df-bday 27155  df-sslt 27290  df-scut 27292
This theorem is referenced by: (None)
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