Theorem ndsubaddd-P7.CL 920

Description: Closed Form of ndsubaddd-P7 858. †

Assertion

Ref	Expression
ndsubaddd-P7.CL	⊢ ((𝑠 = 𝑡 ∧ 𝑢 = 𝑤) → (𝑠 + 𝑢) = (𝑡 + 𝑤))

Proof of Theorem ndsubaddd-P7.CL

Step	Hyp	Ref	Expression
1		rcp-NDASM1of2 193	. 2 ⊢ ((𝑠 = 𝑡 ∧ 𝑢 = 𝑤) → 𝑠 = 𝑡)
2		rcp-NDASM2of2 194	. 2 ⊢ ((𝑠 = 𝑡 ∧ 𝑢 = 𝑤) → 𝑢 = 𝑤)
3	1, 2	ndsubaddd-P7 858	1 ⊢ ((𝑠 = 𝑡 ∧ 𝑢 = 𝑤) → (𝑠 + 𝑢) = (𝑡 + 𝑤))

Syntax hints:   + term-add 4   = wff-equals 6   → wff-imp 10   ∧ wff-and 132

This theorem was proved from axioms:  ax-L1 11  ax-L2 12  ax-L3 13  ax-MP 14  ax-GEN 15  ax-L4 16  ax-L5 17  ax-L6 18  ax-L7 19  ax-L9-addl 23  ax-L9-addr 24

This theorem depends on definitions:  df-bi-D2.1 107  df-and-D2.2 133  df-or-D2.3 145  df-true-D2.4 155  df-rcp-AND3 161  df-exists-D5.1 596

This theorem is referenced by:  nfradd-P8  1120