Theorem measfn 31458

Description: A measure is a function on its base sigma-algebra. (Contributed by Thierry Arnoux, 13-Feb-2017.)

Assertion

Ref	Expression
measfn	⊢ (𝑀 ∈ (measures‘𝑆) → 𝑀 Fn 𝑆)

Proof of Theorem measfn

Step	Hyp	Ref	Expression
1		measfrge0 31457	. 2 ⊢ (𝑀 ∈ (measures‘𝑆) → 𝑀:𝑆⟶(0[,]+∞))
2	1	ffnd 6509	1 ⊢ (𝑀 ∈ (measures‘𝑆) → 𝑀 Fn 𝑆)

Syntax hints:   → wi 4   ∈ wcel 2110   Fn wfn 6344  ‘cfv 6349  (class class class)co 7150  0cc0 10531  +∞cpnf 10666  [,]cicc 12735  measurescmeas 31449

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-fal 1546  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5059  df-opab 5121  df-mpt 5139  df-id 5454  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-fv 6357  df-ov 7153  df-esum 31282  df-meas 31450

This theorem is referenced by:  probfinmeasb  31681  dstfrvclim1  31730