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Theorem elmapssres 6948
Description: A restricted mapping is a mapping. (Contributed by Stefan O'Rear, 9-Oct-2014.) (Revised by Mario Carneiro, 5-May-2015.)
Assertion
Ref Expression
elmapssres ((𝐴 ∈ (𝐵𝑚 𝐶) ∧ 𝐷𝐶) → (𝐴𝐷) ∈ (𝐵𝑚 𝐷))

Proof of Theorem elmapssres
StepHypRef Expression
1 elmapi 6938 . . 3 (𝐴 ∈ (𝐵𝑚 𝐶) → 𝐴:𝐶𝐵)
2 fssres 5563 . . 3 ((𝐴:𝐶𝐵𝐷𝐶) → (𝐴𝐷):𝐷𝐵)
31, 2sylan 283 . 2 ((𝐴 ∈ (𝐵𝑚 𝐶) ∧ 𝐷𝐶) → (𝐴𝐷):𝐷𝐵)
4 elmapex 6937 . . . . 5 (𝐴 ∈ (𝐵𝑚 𝐶) → (𝐵 ∈ V ∧ 𝐶 ∈ V))
54simpld 112 . . . 4 (𝐴 ∈ (𝐵𝑚 𝐶) → 𝐵 ∈ V)
65adantr 276 . . 3 ((𝐴 ∈ (𝐵𝑚 𝐶) ∧ 𝐷𝐶) → 𝐵 ∈ V)
74simprd 114 . . . 4 (𝐴 ∈ (𝐵𝑚 𝐶) → 𝐶 ∈ V)
8 ssexg 4270 . . . . 5 ((𝐷𝐶𝐶 ∈ V) → 𝐷 ∈ V)
98ancoms 268 . . . 4 ((𝐶 ∈ V ∧ 𝐷𝐶) → 𝐷 ∈ V)
107, 9sylan 283 . . 3 ((𝐴 ∈ (𝐵𝑚 𝐶) ∧ 𝐷𝐶) → 𝐷 ∈ V)
116, 10elmapd 6930 . 2 ((𝐴 ∈ (𝐵𝑚 𝐶) ∧ 𝐷𝐶) → ((𝐴𝐷) ∈ (𝐵𝑚 𝐷) ↔ (𝐴𝐷):𝐷𝐵))
123, 11mpbird 167 1 ((𝐴 ∈ (𝐵𝑚 𝐶) ∧ 𝐷𝐶) → (𝐴𝐷) ∈ (𝐵𝑚 𝐷))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wcel 2209  Vcvv 2821  wss 3220  cres 4774  wf 5371  (class class class)co 6079  𝑚 cmap 6916
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-br 4129  df-opab 4191  df-id 4436  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-fv 5383  df-ov 6082  df-oprab 6083  df-mpo 6084  df-map 6918
This theorem is referenced by: (None)
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