Theorem fssres 5460

Description: Restriction of a function with a subclass of its domain. (Contributed by NM, 23-Sep-2004.)

Assertion

Ref	Expression
fssres	⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → (𝐹 ↾ 𝐶):𝐶⟶𝐵)

Proof of Theorem fssres

Step	Hyp	Ref	Expression
1		df-f 5281	. . 3 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵))
2		fnssres 5395	. . . . 5 ⊢ ((𝐹 Fn 𝐴 ∧ 𝐶 ⊆ 𝐴) → (𝐹 ↾ 𝐶) Fn 𝐶)
3		resss 4989	. . . . . . 7 ⊢ (𝐹 ↾ 𝐶) ⊆ 𝐹
4		rnss 4914	. . . . . . 7 ⊢ ((𝐹 ↾ 𝐶) ⊆ 𝐹 → ran (𝐹 ↾ 𝐶) ⊆ ran 𝐹)
5	3, 4	ax-mp 5	. . . . . 6 ⊢ ran (𝐹 ↾ 𝐶) ⊆ ran 𝐹
6		sstr 3203	. . . . . 6 ⊢ ((ran (𝐹 ↾ 𝐶) ⊆ ran 𝐹 ∧ ran 𝐹 ⊆ 𝐵) → ran (𝐹 ↾ 𝐶) ⊆ 𝐵)
7	5, 6	mpan 424	. . . . 5 ⊢ (ran 𝐹 ⊆ 𝐵 → ran (𝐹 ↾ 𝐶) ⊆ 𝐵)
8	2, 7	anim12i 338	. . . 4 ⊢ (((𝐹 Fn 𝐴 ∧ 𝐶 ⊆ 𝐴) ∧ ran 𝐹 ⊆ 𝐵) → ((𝐹 ↾ 𝐶) Fn 𝐶 ∧ ran (𝐹 ↾ 𝐶) ⊆ 𝐵))
9	8	an32s 568	. . 3 ⊢ (((𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵) ∧ 𝐶 ⊆ 𝐴) → ((𝐹 ↾ 𝐶) Fn 𝐶 ∧ ran (𝐹 ↾ 𝐶) ⊆ 𝐵))
10	1, 9	sylanb 284	. 2 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → ((𝐹 ↾ 𝐶) Fn 𝐶 ∧ ran (𝐹 ↾ 𝐶) ⊆ 𝐵))
11		df-f 5281	. 2 ⊢ ((𝐹 ↾ 𝐶):𝐶⟶𝐵 ↔ ((𝐹 ↾ 𝐶) Fn 𝐶 ∧ ran (𝐹 ↾ 𝐶) ⊆ 𝐵))
12	10, 11	sylibr 134	1 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ⊆ 𝐴) → (𝐹 ↾ 𝐶):𝐶⟶𝐵)

Syntax hints:   → wi 4   ∧ wa 104   ⊆ wss 3168  ran crn 4681   ↾ cres 4682   Fn wfn 5272  ⟶wf 5273

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-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2180  ax-ext 2188  ax-sep 4167  ax-pow 4223  ax-pr 4258

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ral 2490  df-rex 2491  df-v 2775  df-un 3172  df-in 3174  df-ss 3181  df-pw 3620  df-sn 3641  df-pr 3642  df-op 3644  df-br 4049  df-opab 4111  df-xp 4686  df-rel 4687  df-cnv 4688  df-co 4689  df-dm 4690  df-rn 4691  df-res 4692  df-fun 5279  df-fn 5280  df-f 5281

This theorem is referenced by:  fssresd  5461  fssres2  5462  fresin  5463  f1ssres  5499  feqresmpt  5643  f2ndf  6322  elmapssres  6770  pmresg  6773  finomni  7254  fseq1p1m1  10229  seqf1oglem2  10678  wrdred1  11049  resmhm  13369  resghm  13646  hmeores  14837  limcdifap  15184  012of  16045  2o01f  16046