Metamath Proof Explorer


Definition df-1

Description: Define the complex number 1. (Contributed by NM, 22-Feb-1996) (New usage is discouraged.)

Ref Expression
Assertion df-1 1=1𝑹0𝑹

Detailed syntax breakdown

Step Hyp Ref Expression
0 c1 class1
1 c1r class1𝑹
2 c0r class0𝑹
3 1 2 cop class1𝑹0𝑹
4 0 3 wceq wff1=1𝑹0𝑹