Metamath Proof Explorer
Description: A number that sums to itself is zero. Compare addid0 ,
readdid1addid2d . (Contributed by SN, 5-May-2024)
|
|
Ref |
Expression |
|
Hypotheses |
sn-addid0.a |
⊢ ( 𝜑 → 𝐴 ∈ ℂ ) |
|
|
sn-addid0.1 |
⊢ ( 𝜑 → ( 𝐴 + 𝐴 ) = 𝐴 ) |
|
Assertion |
sn-addid0 |
⊢ ( 𝜑 → 𝐴 = 0 ) |
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
sn-addid0.a |
⊢ ( 𝜑 → 𝐴 ∈ ℂ ) |
2 |
|
sn-addid0.1 |
⊢ ( 𝜑 → ( 𝐴 + 𝐴 ) = 𝐴 ) |
3 |
|
sn-addid1 |
⊢ ( 𝐴 ∈ ℂ → ( 𝐴 + 0 ) = 𝐴 ) |
4 |
1 3
|
syl |
⊢ ( 𝜑 → ( 𝐴 + 0 ) = 𝐴 ) |
5 |
2 4
|
eqtr4d |
⊢ ( 𝜑 → ( 𝐴 + 𝐴 ) = ( 𝐴 + 0 ) ) |
6 |
|
0cnd |
⊢ ( 𝜑 → 0 ∈ ℂ ) |
7 |
1 1 6
|
sn-addcand |
⊢ ( 𝜑 → ( ( 𝐴 + 𝐴 ) = ( 𝐴 + 0 ) ↔ 𝐴 = 0 ) ) |
8 |
5 7
|
mpbid |
⊢ ( 𝜑 → 𝐴 = 0 ) |