Theorem rncoss 4911

Description: Range of a composition. (Contributed by NM, 19-Mar-1998.)

Assertion

Ref	Expression
rncoss	⊢ ran (𝐴 ∘ 𝐵) ⊆ ran 𝐴

Proof of Theorem rncoss

Step	Hyp	Ref	Expression
1		dmcoss 4910	. 2 ⊢ dom (◡𝐵 ∘ ◡𝐴) ⊆ dom ◡𝐴
2		df-rn 4651	. . 3 ⊢ ran (𝐴 ∘ 𝐵) = dom ◡(𝐴 ∘ 𝐵)
3		cnvco 4826	. . . 4 ⊢ ◡(𝐴 ∘ 𝐵) = (◡𝐵 ∘ ◡𝐴)
4	3	dmeqi 4842	. . 3 ⊢ dom ◡(𝐴 ∘ 𝐵) = dom (◡𝐵 ∘ ◡𝐴)
5	2, 4	eqtri 2209	. 2 ⊢ ran (𝐴 ∘ 𝐵) = dom (◡𝐵 ∘ ◡𝐴)
6		df-rn 4651	. 2 ⊢ ran 𝐴 = dom ◡𝐴
7	1, 5, 6	3sstr4i 3210	1 ⊢ ran (𝐴 ∘ 𝐵) ⊆ ran 𝐴

Syntax hints:   ⊆ wss 3143  ^◡ccnv 4639  dom cdm 4640  ran crn 4641   ∘ ccom 4644

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 710  ax-5 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-14 2162  ax-ext 2170  ax-sep 4135  ax-pow 4188  ax-pr 4223

This theorem depends on definitions:  df-bi 117  df-3an 981  df-tru 1366  df-nf 1471  df-sb 1773  df-eu 2040  df-mo 2041  df-clab 2175  df-cleq 2181  df-clel 2184  df-nfc 2320  df-v 2753  df-un 3147  df-in 3149  df-ss 3156  df-pw 3591  df-sn 3612  df-pr 3613  df-op 3615  df-br 4018  df-opab 4079  df-cnv 4648  df-co 4649  df-dm 4650  df-rn 4651

This theorem is referenced by:  cossxp  5165  fco  5395  caseinj  7105  djuinj  7122