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Theorem comet 13293
Description: The composition of an extended metric with a monotonic subadditive function is an extended metric. (Contributed by Mario Carneiro, 21-Mar-2015.)
Hypotheses
Ref Expression
comet.1 (𝜑𝐷 ∈ (∞Met‘𝑋))
comet.2 (𝜑𝐹:(0[,]+∞)⟶ℝ*)
comet.3 ((𝜑𝑥 ∈ (0[,]+∞)) → ((𝐹𝑥) = 0 ↔ 𝑥 = 0))
comet.4 ((𝜑 ∧ (𝑥 ∈ (0[,]+∞) ∧ 𝑦 ∈ (0[,]+∞))) → (𝑥𝑦 → (𝐹𝑥) ≤ (𝐹𝑦)))
comet.5 ((𝜑 ∧ (𝑥 ∈ (0[,]+∞) ∧ 𝑦 ∈ (0[,]+∞))) → (𝐹‘(𝑥 +𝑒 𝑦)) ≤ ((𝐹𝑥) +𝑒 (𝐹𝑦)))
Assertion
Ref Expression
comet (𝜑 → (𝐹𝐷) ∈ (∞Met‘𝑋))
Distinct variable groups:   𝑥,𝑦,𝐷   𝑥,𝐹,𝑦   𝜑,𝑥,𝑦
Allowed substitution hints:   𝑋(𝑥,𝑦)

Proof of Theorem comet
Dummy variables 𝑎 𝑏 𝑐 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 xmetrel 13137 . . . 4 Rel ∞Met
2 comet.1 . . . 4 (𝜑𝐷 ∈ (∞Met‘𝑋))
3 relelfvdm 5528 . . . 4 ((Rel ∞Met ∧ 𝐷 ∈ (∞Met‘𝑋)) → 𝑋 ∈ dom ∞Met)
41, 2, 3sylancr 412 . . 3 (𝜑𝑋 ∈ dom ∞Met)
54elexd 2743 . 2 (𝜑𝑋 ∈ V)
6 comet.2 . . 3 (𝜑𝐹:(0[,]+∞)⟶ℝ*)
7 xmetf 13144 . . . . . 6 (𝐷 ∈ (∞Met‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
82, 7syl 14 . . . . 5 (𝜑𝐷:(𝑋 × 𝑋)⟶ℝ*)
98ffnd 5348 . . . 4 (𝜑𝐷 Fn (𝑋 × 𝑋))
10 xmetcl 13146 . . . . . . . 8 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑎𝑋𝑏𝑋) → (𝑎𝐷𝑏) ∈ ℝ*)
11 xmetge0 13159 . . . . . . . 8 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑎𝑋𝑏𝑋) → 0 ≤ (𝑎𝐷𝑏))
12 elxrge0 9935 . . . . . . . 8 ((𝑎𝐷𝑏) ∈ (0[,]+∞) ↔ ((𝑎𝐷𝑏) ∈ ℝ* ∧ 0 ≤ (𝑎𝐷𝑏)))
1310, 11, 12sylanbrc 415 . . . . . . 7 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑎𝑋𝑏𝑋) → (𝑎𝐷𝑏) ∈ (0[,]+∞))
14133expb 1199 . . . . . 6 ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑎𝑋𝑏𝑋)) → (𝑎𝐷𝑏) ∈ (0[,]+∞))
152, 14sylan 281 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → (𝑎𝐷𝑏) ∈ (0[,]+∞))
1615ralrimivva 2552 . . . 4 (𝜑 → ∀𝑎𝑋𝑏𝑋 (𝑎𝐷𝑏) ∈ (0[,]+∞))
17 ffnov 5957 . . . 4 (𝐷:(𝑋 × 𝑋)⟶(0[,]+∞) ↔ (𝐷 Fn (𝑋 × 𝑋) ∧ ∀𝑎𝑋𝑏𝑋 (𝑎𝐷𝑏) ∈ (0[,]+∞)))
189, 16, 17sylanbrc 415 . . 3 (𝜑𝐷:(𝑋 × 𝑋)⟶(0[,]+∞))
19 fco 5363 . . 3 ((𝐹:(0[,]+∞)⟶ℝ*𝐷:(𝑋 × 𝑋)⟶(0[,]+∞)) → (𝐹𝐷):(𝑋 × 𝑋)⟶ℝ*)
206, 18, 19syl2anc 409 . 2 (𝜑 → (𝐹𝐷):(𝑋 × 𝑋)⟶ℝ*)
21 opelxpi 4643 . . . . . 6 ((𝑎𝑋𝑏𝑋) → ⟨𝑎, 𝑏⟩ ∈ (𝑋 × 𝑋))
22 fvco3 5567 . . . . . 6 ((𝐷:(𝑋 × 𝑋)⟶ℝ* ∧ ⟨𝑎, 𝑏⟩ ∈ (𝑋 × 𝑋)) → ((𝐹𝐷)‘⟨𝑎, 𝑏⟩) = (𝐹‘(𝐷‘⟨𝑎, 𝑏⟩)))
238, 21, 22syl2an 287 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → ((𝐹𝐷)‘⟨𝑎, 𝑏⟩) = (𝐹‘(𝐷‘⟨𝑎, 𝑏⟩)))
24 df-ov 5856 . . . . 5 (𝑎(𝐹𝐷)𝑏) = ((𝐹𝐷)‘⟨𝑎, 𝑏⟩)
25 df-ov 5856 . . . . . 6 (𝑎𝐷𝑏) = (𝐷‘⟨𝑎, 𝑏⟩)
2625fveq2i 5499 . . . . 5 (𝐹‘(𝑎𝐷𝑏)) = (𝐹‘(𝐷‘⟨𝑎, 𝑏⟩))
2723, 24, 263eqtr4g 2228 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → (𝑎(𝐹𝐷)𝑏) = (𝐹‘(𝑎𝐷𝑏)))
2827eqeq1d 2179 . . 3 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → ((𝑎(𝐹𝐷)𝑏) = 0 ↔ (𝐹‘(𝑎𝐷𝑏)) = 0))
29 fveq2 5496 . . . . . 6 (𝑥 = (𝑎𝐷𝑏) → (𝐹𝑥) = (𝐹‘(𝑎𝐷𝑏)))
3029eqeq1d 2179 . . . . 5 (𝑥 = (𝑎𝐷𝑏) → ((𝐹𝑥) = 0 ↔ (𝐹‘(𝑎𝐷𝑏)) = 0))
31 eqeq1 2177 . . . . 5 (𝑥 = (𝑎𝐷𝑏) → (𝑥 = 0 ↔ (𝑎𝐷𝑏) = 0))
3230, 31bibi12d 234 . . . 4 (𝑥 = (𝑎𝐷𝑏) → (((𝐹𝑥) = 0 ↔ 𝑥 = 0) ↔ ((𝐹‘(𝑎𝐷𝑏)) = 0 ↔ (𝑎𝐷𝑏) = 0)))
33 comet.3 . . . . . 6 ((𝜑𝑥 ∈ (0[,]+∞)) → ((𝐹𝑥) = 0 ↔ 𝑥 = 0))
3433ralrimiva 2543 . . . . 5 (𝜑 → ∀𝑥 ∈ (0[,]+∞)((𝐹𝑥) = 0 ↔ 𝑥 = 0))
3534adantr 274 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → ∀𝑥 ∈ (0[,]+∞)((𝐹𝑥) = 0 ↔ 𝑥 = 0))
3632, 35, 15rspcdva 2839 . . 3 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → ((𝐹‘(𝑎𝐷𝑏)) = 0 ↔ (𝑎𝐷𝑏) = 0))
37 xmeteq0 13153 . . . . 5 ((𝐷 ∈ (∞Met‘𝑋) ∧ 𝑎𝑋𝑏𝑋) → ((𝑎𝐷𝑏) = 0 ↔ 𝑎 = 𝑏))
38373expb 1199 . . . 4 ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑎𝑋𝑏𝑋)) → ((𝑎𝐷𝑏) = 0 ↔ 𝑎 = 𝑏))
392, 38sylan 281 . . 3 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → ((𝑎𝐷𝑏) = 0 ↔ 𝑎 = 𝑏))
4028, 36, 393bitrd 213 . 2 ((𝜑 ∧ (𝑎𝑋𝑏𝑋)) → ((𝑎(𝐹𝐷)𝑏) = 0 ↔ 𝑎 = 𝑏))
416adantr 274 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → 𝐹:(0[,]+∞)⟶ℝ*)
42153adantr3 1153 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑎𝐷𝑏) ∈ (0[,]+∞))
4341, 42ffvelrnd 5632 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘(𝑎𝐷𝑏)) ∈ ℝ*)
4418adantr 274 . . . . . . 7 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → 𝐷:(𝑋 × 𝑋)⟶(0[,]+∞))
45 simpr3 1000 . . . . . . 7 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → 𝑐𝑋)
46 simpr1 998 . . . . . . 7 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → 𝑎𝑋)
4744, 45, 46fovrnd 5997 . . . . . 6 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑐𝐷𝑎) ∈ (0[,]+∞))
48 simpr2 999 . . . . . . 7 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → 𝑏𝑋)
4944, 45, 48fovrnd 5997 . . . . . 6 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑐𝐷𝑏) ∈ (0[,]+∞))
50 ge0xaddcl 9940 . . . . . 6 (((𝑐𝐷𝑎) ∈ (0[,]+∞) ∧ (𝑐𝐷𝑏) ∈ (0[,]+∞)) → ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) ∈ (0[,]+∞))
5147, 49, 50syl2anc 409 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) ∈ (0[,]+∞))
5241, 51ffvelrnd 5632 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))) ∈ ℝ*)
5341, 47ffvelrnd 5632 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘(𝑐𝐷𝑎)) ∈ ℝ*)
5441, 49ffvelrnd 5632 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘(𝑐𝐷𝑏)) ∈ ℝ*)
5553, 54xaddcld 9841 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏))) ∈ ℝ*)
56 3anrot 978 . . . . . . 7 ((𝑐𝑋𝑎𝑋𝑏𝑋) ↔ (𝑎𝑋𝑏𝑋𝑐𝑋))
57 xmettri2 13155 . . . . . . 7 ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑐𝑋𝑎𝑋𝑏𝑋)) → (𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))
5856, 57sylan2br 286 . . . . . 6 ((𝐷 ∈ (∞Met‘𝑋) ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))
592, 58sylan 281 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))
60 comet.4 . . . . . . . 8 ((𝜑 ∧ (𝑥 ∈ (0[,]+∞) ∧ 𝑦 ∈ (0[,]+∞))) → (𝑥𝑦 → (𝐹𝑥) ≤ (𝐹𝑦)))
6160ralrimivva 2552 . . . . . . 7 (𝜑 → ∀𝑥 ∈ (0[,]+∞)∀𝑦 ∈ (0[,]+∞)(𝑥𝑦 → (𝐹𝑥) ≤ (𝐹𝑦)))
6261adantr 274 . . . . . 6 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ∀𝑥 ∈ (0[,]+∞)∀𝑦 ∈ (0[,]+∞)(𝑥𝑦 → (𝐹𝑥) ≤ (𝐹𝑦)))
63 breq1 3992 . . . . . . . 8 (𝑥 = (𝑎𝐷𝑏) → (𝑥𝑦 ↔ (𝑎𝐷𝑏) ≤ 𝑦))
6429breq1d 3999 . . . . . . . 8 (𝑥 = (𝑎𝐷𝑏) → ((𝐹𝑥) ≤ (𝐹𝑦) ↔ (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹𝑦)))
6563, 64imbi12d 233 . . . . . . 7 (𝑥 = (𝑎𝐷𝑏) → ((𝑥𝑦 → (𝐹𝑥) ≤ (𝐹𝑦)) ↔ ((𝑎𝐷𝑏) ≤ 𝑦 → (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹𝑦))))
66 breq2 3993 . . . . . . . 8 (𝑦 = ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → ((𝑎𝐷𝑏) ≤ 𝑦 ↔ (𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))))
67 fveq2 5496 . . . . . . . . 9 (𝑦 = ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → (𝐹𝑦) = (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))))
6867breq2d 4001 . . . . . . . 8 (𝑦 = ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → ((𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹𝑦) ↔ (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))))
6966, 68imbi12d 233 . . . . . . 7 (𝑦 = ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → (((𝑎𝐷𝑏) ≤ 𝑦 → (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹𝑦)) ↔ ((𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))))))
7065, 69rspc2va 2848 . . . . . 6 ((((𝑎𝐷𝑏) ∈ (0[,]+∞) ∧ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) ∈ (0[,]+∞)) ∧ ∀𝑥 ∈ (0[,]+∞)∀𝑦 ∈ (0[,]+∞)(𝑥𝑦 → (𝐹𝑥) ≤ (𝐹𝑦))) → ((𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))))
7142, 51, 62, 70syl21anc 1232 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ((𝑎𝐷𝑏) ≤ ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)) → (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))))
7259, 71mpd 13 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘(𝑎𝐷𝑏)) ≤ (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))))
73 comet.5 . . . . . . 7 ((𝜑 ∧ (𝑥 ∈ (0[,]+∞) ∧ 𝑦 ∈ (0[,]+∞))) → (𝐹‘(𝑥 +𝑒 𝑦)) ≤ ((𝐹𝑥) +𝑒 (𝐹𝑦)))
7473ralrimivva 2552 . . . . . 6 (𝜑 → ∀𝑥 ∈ (0[,]+∞)∀𝑦 ∈ (0[,]+∞)(𝐹‘(𝑥 +𝑒 𝑦)) ≤ ((𝐹𝑥) +𝑒 (𝐹𝑦)))
7574adantr 274 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ∀𝑥 ∈ (0[,]+∞)∀𝑦 ∈ (0[,]+∞)(𝐹‘(𝑥 +𝑒 𝑦)) ≤ ((𝐹𝑥) +𝑒 (𝐹𝑦)))
76 fvoveq1 5876 . . . . . . 7 (𝑥 = (𝑐𝐷𝑎) → (𝐹‘(𝑥 +𝑒 𝑦)) = (𝐹‘((𝑐𝐷𝑎) +𝑒 𝑦)))
77 fveq2 5496 . . . . . . . 8 (𝑥 = (𝑐𝐷𝑎) → (𝐹𝑥) = (𝐹‘(𝑐𝐷𝑎)))
7877oveq1d 5868 . . . . . . 7 (𝑥 = (𝑐𝐷𝑎) → ((𝐹𝑥) +𝑒 (𝐹𝑦)) = ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹𝑦)))
7976, 78breq12d 4002 . . . . . 6 (𝑥 = (𝑐𝐷𝑎) → ((𝐹‘(𝑥 +𝑒 𝑦)) ≤ ((𝐹𝑥) +𝑒 (𝐹𝑦)) ↔ (𝐹‘((𝑐𝐷𝑎) +𝑒 𝑦)) ≤ ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹𝑦))))
80 oveq2 5861 . . . . . . . 8 (𝑦 = (𝑐𝐷𝑏) → ((𝑐𝐷𝑎) +𝑒 𝑦) = ((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏)))
8180fveq2d 5500 . . . . . . 7 (𝑦 = (𝑐𝐷𝑏) → (𝐹‘((𝑐𝐷𝑎) +𝑒 𝑦)) = (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))))
82 fveq2 5496 . . . . . . . 8 (𝑦 = (𝑐𝐷𝑏) → (𝐹𝑦) = (𝐹‘(𝑐𝐷𝑏)))
8382oveq2d 5869 . . . . . . 7 (𝑦 = (𝑐𝐷𝑏) → ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹𝑦)) = ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏))))
8481, 83breq12d 4002 . . . . . 6 (𝑦 = (𝑐𝐷𝑏) → ((𝐹‘((𝑐𝐷𝑎) +𝑒 𝑦)) ≤ ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹𝑦)) ↔ (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))) ≤ ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏)))))
8579, 84rspc2va 2848 . . . . 5 ((((𝑐𝐷𝑎) ∈ (0[,]+∞) ∧ (𝑐𝐷𝑏) ∈ (0[,]+∞)) ∧ ∀𝑥 ∈ (0[,]+∞)∀𝑦 ∈ (0[,]+∞)(𝐹‘(𝑥 +𝑒 𝑦)) ≤ ((𝐹𝑥) +𝑒 (𝐹𝑦))) → (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))) ≤ ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏))))
8647, 49, 75, 85syl21anc 1232 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘((𝑐𝐷𝑎) +𝑒 (𝑐𝐷𝑏))) ≤ ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏))))
8743, 52, 55, 72, 86xrletrd 9769 . . 3 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝐹‘(𝑎𝐷𝑏)) ≤ ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏))))
88273adantr3 1153 . . 3 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑎(𝐹𝐷)𝑏) = (𝐹‘(𝑎𝐷𝑏)))
898adantr 274 . . . . . 6 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
9045, 46opelxpd 4644 . . . . . 6 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ⟨𝑐, 𝑎⟩ ∈ (𝑋 × 𝑋))
91 fvco3 5567 . . . . . 6 ((𝐷:(𝑋 × 𝑋)⟶ℝ* ∧ ⟨𝑐, 𝑎⟩ ∈ (𝑋 × 𝑋)) → ((𝐹𝐷)‘⟨𝑐, 𝑎⟩) = (𝐹‘(𝐷‘⟨𝑐, 𝑎⟩)))
9289, 90, 91syl2anc 409 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ((𝐹𝐷)‘⟨𝑐, 𝑎⟩) = (𝐹‘(𝐷‘⟨𝑐, 𝑎⟩)))
93 df-ov 5856 . . . . 5 (𝑐(𝐹𝐷)𝑎) = ((𝐹𝐷)‘⟨𝑐, 𝑎⟩)
94 df-ov 5856 . . . . . 6 (𝑐𝐷𝑎) = (𝐷‘⟨𝑐, 𝑎⟩)
9594fveq2i 5499 . . . . 5 (𝐹‘(𝑐𝐷𝑎)) = (𝐹‘(𝐷‘⟨𝑐, 𝑎⟩))
9692, 93, 953eqtr4g 2228 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑐(𝐹𝐷)𝑎) = (𝐹‘(𝑐𝐷𝑎)))
9745, 48opelxpd 4644 . . . . . 6 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ⟨𝑐, 𝑏⟩ ∈ (𝑋 × 𝑋))
98 fvco3 5567 . . . . . 6 ((𝐷:(𝑋 × 𝑋)⟶ℝ* ∧ ⟨𝑐, 𝑏⟩ ∈ (𝑋 × 𝑋)) → ((𝐹𝐷)‘⟨𝑐, 𝑏⟩) = (𝐹‘(𝐷‘⟨𝑐, 𝑏⟩)))
9989, 97, 98syl2anc 409 . . . . 5 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ((𝐹𝐷)‘⟨𝑐, 𝑏⟩) = (𝐹‘(𝐷‘⟨𝑐, 𝑏⟩)))
100 df-ov 5856 . . . . 5 (𝑐(𝐹𝐷)𝑏) = ((𝐹𝐷)‘⟨𝑐, 𝑏⟩)
101 df-ov 5856 . . . . . 6 (𝑐𝐷𝑏) = (𝐷‘⟨𝑐, 𝑏⟩)
102101fveq2i 5499 . . . . 5 (𝐹‘(𝑐𝐷𝑏)) = (𝐹‘(𝐷‘⟨𝑐, 𝑏⟩))
10399, 100, 1023eqtr4g 2228 . . . 4 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑐(𝐹𝐷)𝑏) = (𝐹‘(𝑐𝐷𝑏)))
10496, 103oveq12d 5871 . . 3 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → ((𝑐(𝐹𝐷)𝑎) +𝑒 (𝑐(𝐹𝐷)𝑏)) = ((𝐹‘(𝑐𝐷𝑎)) +𝑒 (𝐹‘(𝑐𝐷𝑏))))
10587, 88, 1043brtr4d 4021 . 2 ((𝜑 ∧ (𝑎𝑋𝑏𝑋𝑐𝑋)) → (𝑎(𝐹𝐷)𝑏) ≤ ((𝑐(𝐹𝐷)𝑎) +𝑒 (𝑐(𝐹𝐷)𝑏)))
1065, 20, 40, 105isxmetd 13141 1 (𝜑 → (𝐹𝐷) ∈ (∞Met‘𝑋))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wb 104  w3a 973   = wceq 1348  wcel 2141  wral 2448  cop 3586   class class class wbr 3989   × cxp 4609  dom cdm 4611  ccom 4615  Rel wrel 4616   Fn wfn 5193  wf 5194  cfv 5198  (class class class)co 5853  0cc0 7774  +∞cpnf 7951  *cxr 7953  cle 7955   +𝑒 cxad 9727  [,]cicc 9848  ∞Metcxmet 12774
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-precex 7884  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891
This theorem depends on definitions:  df-bi 116  df-dc 830  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-if 3527  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-iun 3875  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-po 4281  df-iso 4282  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-fv 5206  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-map 6628  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-2 8937  df-xadd 9730  df-icc 9852  df-xmet 12782
This theorem is referenced by:  bdxmet  13295
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