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Metamath Proof Explorer
Description: e220 without virtual deductions. (Contributed by Alan Sare, 12-Jul-2011) (Proof modification is discouraged.)
(New usage is discouraged.)
|
|
Ref |
Expression |
|
Hypotheses |
ee220.1 |
⊢ ( 𝜑 → ( 𝜓 → 𝜒 ) ) |
|
|
ee220.2 |
⊢ ( 𝜑 → ( 𝜓 → 𝜃 ) ) |
|
|
ee220.3 |
⊢ 𝜏 |
|
|
ee220.4 |
⊢ ( 𝜒 → ( 𝜃 → ( 𝜏 → 𝜂 ) ) ) |
|
Assertion |
ee220 |
⊢ ( 𝜑 → ( 𝜓 → 𝜂 ) ) |
Proof
| Step |
Hyp |
Ref |
Expression |
| 1 |
|
ee220.1 |
⊢ ( 𝜑 → ( 𝜓 → 𝜒 ) ) |
| 2 |
|
ee220.2 |
⊢ ( 𝜑 → ( 𝜓 → 𝜃 ) ) |
| 3 |
|
ee220.3 |
⊢ 𝜏 |
| 4 |
|
ee220.4 |
⊢ ( 𝜒 → ( 𝜃 → ( 𝜏 → 𝜂 ) ) ) |
| 5 |
3
|
2a1i |
⊢ ( 𝜑 → ( 𝜓 → 𝜏 ) ) |
| 6 |
1 2 5 4
|
ee222 |
⊢ ( 𝜑 → ( 𝜓 → 𝜂 ) ) |