Metamath Proof Explorer
Description: Founded Induction schema, using implicit substitution. (Contributed by Scott Fenton, 8-Feb-2011) (Revised by Mario Carneiro, 26-Jun-2015)
|
|
Ref |
Expression |
|
Hypotheses |
frins2g.1 |
⊢ ( 𝑦 ∈ 𝐴 → ( ∀ 𝑧 ∈ Pred ( 𝑅 , 𝐴 , 𝑦 ) 𝜓 → 𝜑 ) ) |
|
|
frins2g.3 |
⊢ ( 𝑦 = 𝑧 → ( 𝜑 ↔ 𝜓 ) ) |
|
Assertion |
frins2g |
⊢ ( ( 𝑅 Fr 𝐴 ∧ 𝑅 Se 𝐴 ) → ∀ 𝑦 ∈ 𝐴 𝜑 ) |
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
frins2g.1 |
⊢ ( 𝑦 ∈ 𝐴 → ( ∀ 𝑧 ∈ Pred ( 𝑅 , 𝐴 , 𝑦 ) 𝜓 → 𝜑 ) ) |
2 |
|
frins2g.3 |
⊢ ( 𝑦 = 𝑧 → ( 𝜑 ↔ 𝜓 ) ) |
3 |
|
nfv |
⊢ Ⅎ 𝑦 𝜓 |
4 |
1 3 2
|
frins2fg |
⊢ ( ( 𝑅 Fr 𝐴 ∧ 𝑅 Se 𝐴 ) → ∀ 𝑦 ∈ 𝐴 𝜑 ) |