This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

Metamath Proof Explorer

Theorem leadd1d

Description: Addition to both sides of 'less than or equal to'. (Contributed by Mario Carneiro, 27-May-2016)

Ref Expression
Hypotheses leidd.1 ⊢ ( 𝜑 → 𝐴 ∈ ℝ )
ltnegd.2 ⊢ ( 𝜑 → 𝐵 ∈ ℝ )
ltadd1d.3 ⊢ ( 𝜑 → 𝐶 ∈ ℝ )
Assertion leadd1d ( 𝜑 → ( 𝐴 ≤ 𝐵 ↔ ( 𝐴 + 𝐶 ) ≤ ( 𝐵 + 𝐶 ) ) )

Proof

Step Hyp Ref Expression
1 leidd.1 ⊢ ( 𝜑 → 𝐴 ∈ ℝ )
2 ltnegd.2 ⊢ ( 𝜑 → 𝐵 ∈ ℝ )
3 ltadd1d.3 ⊢ ( 𝜑 → 𝐶 ∈ ℝ )
4 leadd1 ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ ) → ( 𝐴 ≤ 𝐵 ↔ ( 𝐴 + 𝐶 ) ≤ ( 𝐵 + 𝐶 ) ) )
5 1 2 3 4 syl3anc ⊢ ( 𝜑 → ( 𝐴 ≤ 𝐵 ↔ ( 𝐴 + 𝐶 ) ≤ ( 𝐵 + 𝐶 ) ) )