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Mirrors > Home > MPE Home > Th. List > znegcld | Structured version Visualization version GIF version |
Description: Closure law for negative integers. (Contributed by Mario Carneiro, 28-May-2016.) |
Ref | Expression |
---|---|
zred.1 | ⊢ (𝜑 → 𝐴 ∈ ℤ) |
Ref | Expression |
---|---|
znegcld | ⊢ (𝜑 → -𝐴 ∈ ℤ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | zred.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℤ) | |
2 | znegcl 12285 | . 2 ⊢ (𝐴 ∈ ℤ → -𝐴 ∈ ℤ) | |
3 | 1, 2 | syl 17 | 1 ⊢ (𝜑 → -𝐴 ∈ ℤ) |
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