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Theorem f1imass 7013
Description: Taking images under a one-to-one function preserves subsets. (Contributed by Stefan O'Rear, 30-Oct-2014.)
Assertion
Ref Expression
f1imass ((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) → ((𝐹𝐶) ⊆ (𝐹𝐷) ↔ 𝐶𝐷))

Proof of Theorem f1imass
Dummy variable 𝑎 is distinct from all other variables.
StepHypRef Expression
1 simplrl 773 . . . . . . 7 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) → 𝐶𝐴)
21sseld 3963 . . . . . 6 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) → (𝑎𝐶𝑎𝐴))
3 simplr 765 . . . . . . . . 9 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → (𝐹𝐶) ⊆ (𝐹𝐷))
43sseld 3963 . . . . . . . 8 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → ((𝐹𝑎) ∈ (𝐹𝐶) → (𝐹𝑎) ∈ (𝐹𝐷)))
5 simplll 771 . . . . . . . . 9 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → 𝐹:𝐴1-1𝐵)
6 simpr 485 . . . . . . . . 9 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → 𝑎𝐴)
7 simp1rl 1230 . . . . . . . . . 10 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷) ∧ 𝑎𝐴) → 𝐶𝐴)
873expa 1110 . . . . . . . . 9 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → 𝐶𝐴)
9 f1elima 7012 . . . . . . . . 9 ((𝐹:𝐴1-1𝐵𝑎𝐴𝐶𝐴) → ((𝐹𝑎) ∈ (𝐹𝐶) ↔ 𝑎𝐶))
105, 6, 8, 9syl3anc 1363 . . . . . . . 8 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → ((𝐹𝑎) ∈ (𝐹𝐶) ↔ 𝑎𝐶))
11 simp1rr 1231 . . . . . . . . . 10 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷) ∧ 𝑎𝐴) → 𝐷𝐴)
12113expa 1110 . . . . . . . . 9 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → 𝐷𝐴)
13 f1elima 7012 . . . . . . . . 9 ((𝐹:𝐴1-1𝐵𝑎𝐴𝐷𝐴) → ((𝐹𝑎) ∈ (𝐹𝐷) ↔ 𝑎𝐷))
145, 6, 12, 13syl3anc 1363 . . . . . . . 8 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → ((𝐹𝑎) ∈ (𝐹𝐷) ↔ 𝑎𝐷))
154, 10, 143imtr3d 294 . . . . . . 7 ((((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) ∧ 𝑎𝐴) → (𝑎𝐶𝑎𝐷))
1615ex 413 . . . . . 6 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) → (𝑎𝐴 → (𝑎𝐶𝑎𝐷)))
172, 16syld 47 . . . . 5 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) → (𝑎𝐶 → (𝑎𝐶𝑎𝐷)))
1817pm2.43d 53 . . . 4 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) → (𝑎𝐶𝑎𝐷))
1918ssrdv 3970 . . 3 (((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) ∧ (𝐹𝐶) ⊆ (𝐹𝐷)) → 𝐶𝐷)
2019ex 413 . 2 ((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) → ((𝐹𝐶) ⊆ (𝐹𝐷) → 𝐶𝐷))
21 imass2 5958 . 2 (𝐶𝐷 → (𝐹𝐶) ⊆ (𝐹𝐷))
2220, 21impbid1 226 1 ((𝐹:𝐴1-1𝐵 ∧ (𝐶𝐴𝐷𝐴)) → ((𝐹𝐶) ⊆ (𝐹𝐷) ↔ 𝐶𝐷))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396  wcel 2105  wss 3933  cima 5551  1-1wf1 6345  cfv 6348
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-sep 5194  ax-nul 5201  ax-pr 5320
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ral 3140  df-rex 3141  df-rab 3144  df-v 3494  df-sbc 3770  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4831  df-br 5058  df-opab 5120  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fv 6356
This theorem is referenced by:  f1imaeq  7014  f1imapss  7015  enfin2i  9731  tsmsf1o  22680
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