Theorem xrge0adddi

Description: Left-distributivity of extended nonnegative real multiplication over addition. (Contributed by Thierry Arnoux, 6-Sep-2018)

	Ref	Expression
Assertion	xrge0adddi	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( 𝐶 ·e ( 𝐴 +𝑒 𝐵 ) ) = ( ( 𝐶 ·e 𝐴 ) +𝑒 ( 𝐶 ·e 𝐵 ) ) )

Proof

Step	Hyp	Ref	Expression
1		xrge0adddir	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( ( 𝐴 +𝑒 𝐵 ) ·e 𝐶 ) = ( ( 𝐴 ·e 𝐶 ) +𝑒 ( 𝐵 ·e 𝐶 ) ) )
2		iccssxr	⊢ ( 0 [,] +∞ ) ⊆ ℝ*
3		simp1	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → 𝐴 ∈ ( 0 [,] +∞ ) )
4	2 3	sseldi	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → 𝐴 ∈ ℝ* )
5		simp2	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → 𝐵 ∈ ( 0 [,] +∞ ) )
6	2 5	sseldi	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → 𝐵 ∈ ℝ* )
7	4 6	xaddcld	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( 𝐴 +𝑒 𝐵 ) ∈ ℝ* )
8		simp3	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → 𝐶 ∈ ( 0 [,] +∞ ) )
9	2 8	sseldi	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → 𝐶 ∈ ℝ* )
10		xmulcom	⊢ ( ( ( 𝐴 +𝑒 𝐵 ) ∈ ℝ* ∧ 𝐶 ∈ ℝ* ) → ( ( 𝐴 +𝑒 𝐵 ) ·e 𝐶 ) = ( 𝐶 ·e ( 𝐴 +𝑒 𝐵 ) ) )
11	7 9 10	syl2anc	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( ( 𝐴 +𝑒 𝐵 ) ·e 𝐶 ) = ( 𝐶 ·e ( 𝐴 +𝑒 𝐵 ) ) )
12		xmulcom	⊢ ( ( 𝐴 ∈ ℝ* ∧ 𝐶 ∈ ℝ* ) → ( 𝐴 ·e 𝐶 ) = ( 𝐶 ·e 𝐴 ) )
13	4 9 12	syl2anc	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( 𝐴 ·e 𝐶 ) = ( 𝐶 ·e 𝐴 ) )
14		xmulcom	⊢ ( ( 𝐵 ∈ ℝ* ∧ 𝐶 ∈ ℝ* ) → ( 𝐵 ·e 𝐶 ) = ( 𝐶 ·e 𝐵 ) )
15	6 9 14	syl2anc	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( 𝐵 ·e 𝐶 ) = ( 𝐶 ·e 𝐵 ) )
16	13 15	oveq12d	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( ( 𝐴 ·e 𝐶 ) +𝑒 ( 𝐵 ·e 𝐶 ) ) = ( ( 𝐶 ·e 𝐴 ) +𝑒 ( 𝐶 ·e 𝐵 ) ) )
17	1 11 16	3eqtr3d	⊢ ( ( 𝐴 ∈ ( 0 [,] +∞ ) ∧ 𝐵 ∈ ( 0 [,] +∞ ) ∧ 𝐶 ∈ ( 0 [,] +∞ ) ) → ( 𝐶 ·e ( 𝐴 +𝑒 𝐵 ) ) = ( ( 𝐶 ·e 𝐴 ) +𝑒 ( 𝐶 ·e 𝐵 ) ) )