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| Mirrors > Home > ILE Home > Th. List > ax-0id | GIF version | ||
| Description: 0
is an identity element for real addition. Axiom for real and
complex numbers, justified by Theorem ax0id 8246.
Proofs should normally use addrid 8466 instead. (New usage is discouraged.) (Contributed by Jim Kingdon, 16-Jan-2020.) |
| Ref | Expression |
|---|---|
| ax-0id | ⊢ (𝐴 ∈ ℂ → (𝐴 + 0) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cA | . . 3 class 𝐴 | |
| 2 | cc 8178 | . . 3 class ℂ | |
| 3 | 1, 2 | wcel 2209 | . 2 wff 𝐴 ∈ ℂ |
| 4 | cc0 8180 | . . . 4 class 0 | |
| 5 | caddc 8183 | . . . 4 class + | |
| 6 | 1, 4, 5 | co 6085 | . . 3 class (𝐴 + 0) |
| 7 | 6, 1 | wceq 1402 | . 2 wff (𝐴 + 0) = 𝐴 |
| 8 | 3, 7 | wi 4 | 1 wff (𝐴 ∈ ℂ → (𝐴 + 0) = 𝐴) |
| Colors of variables: wff set class |
| This axiom is used by: addrid 8466 |
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