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Theorem mulassi 8028
Description: Associative law for multiplication. (Contributed by NM, 23-Nov-1994.)
Hypotheses
Ref Expression
axi.1 𝐴 ∈ ℂ
axi.2 𝐵 ∈ ℂ
axi.3 𝐶 ∈ ℂ
Assertion
Ref Expression
mulassi ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶))

Proof of Theorem mulassi
StepHypRef Expression
1 axi.1 . 2 𝐴 ∈ ℂ
2 axi.2 . 2 𝐵 ∈ ℂ
3 axi.3 . 2 𝐶 ∈ ℂ
4 mulass 8003 . 2 ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶)))
51, 2, 3, 4mp3an 1348 1 ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶))
Colors of variables: wff set class
Syntax hints:   = wceq 1364  wcel 2164  (class class class)co 5918  cc 7870   · cmul 7877
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-mulass 7975
This theorem depends on definitions:  df-bi 117  df-3an 982
This theorem is referenced by:  8th4div3  9201  numma  9491  decbin0  9587  sq4e2t8  10708  3dec  10785  ef01bndlem  11899  3dvdsdec  12006  3dvds2dec  12007  sincos4thpi  14975  sincos6thpi  14977  2lgsoddprmlem3d  15198
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