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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 8073.
Proofs should normally use addrid 8292 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 8005 | . . 3 class ℂ | |
| 3 | 1, 2 | wcel 2200 | . 2 wff 𝐴 ∈ ℂ |
| 4 | cc0 8007 | . . . 4 class 0 | |
| 5 | caddc 8010 | . . . 4 class + | |
| 6 | 1, 4, 5 | co 6007 | . . 3 class (𝐴 + 0) |
| 7 | 6, 1 | wceq 1395 | . 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 referenced by: addrid 8292 |
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