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| Mirrors > Home > MPE Home > Th. List > lemul2ad | Structured version Visualization version GIF version | ||
| Description: Multiplication of both sides of 'less than or equal to' by a nonnegative number. (Contributed by Mario Carneiro, 28-May-2016.) |
| Ref | Expression |
|---|---|
| ltp1d.1 | ⊢ (𝜑 → 𝐴 ∈ ℝ) |
| divgt0d.2 | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
| lemul1ad.3 | ⊢ (𝜑 → 𝐶 ∈ ℝ) |
| lemul1ad.4 | ⊢ (𝜑 → 0 ≤ 𝐶) |
| lemul1ad.5 | ⊢ (𝜑 → 𝐴 ≤ 𝐵) |
| Ref | Expression |
|---|---|
| lemul2ad | ⊢ (𝜑 → (𝐶 · 𝐴) ≤ (𝐶 · 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ltp1d.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ ℝ) | |
| 2 | divgt0d.2 | . 2 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
| 3 | lemul1ad.3 | . . 3 ⊢ (𝜑 → 𝐶 ∈ ℝ) | |
| 4 | lemul1ad.4 | . . 3 ⊢ (𝜑 → 0 ≤ 𝐶) | |
| 5 | 3, 4 | jca 511 | . 2 ⊢ (𝜑 → (𝐶 ∈ ℝ ∧ 0 ≤ 𝐶)) |
| 6 | lemul1ad.5 | . 2 ⊢ (𝜑 → 𝐴 ≤ 𝐵) | |
| 7 | lemul2a 12122 | . 2 ⊢ (((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐶 ∈ ℝ ∧ 0 ≤ 𝐶)) ∧ 𝐴 ≤ 𝐵) → (𝐶 · 𝐴) ≤ (𝐶 · 𝐵)) | |
| 8 | 1, 2, 5, 6, 7 | syl31anc 1375 | 1 ⊢ (𝜑 → (𝐶 · 𝐴) ≤ (𝐶 · 𝐵)) |
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