The Logic Resource Center
Public Alpha
Systems
Open options
Systems
The Logic Resource Center
Public Alpha
Systems
Open options
Systems
Conditional Elimination For Material Definition
Constants
→
¬
∨
Systems
OLI
Start a Problem
→
Conditional Elimination For Material Definition
i.
(
ϕ
→
ψ
)
⋮
ii.
(
¬
ϕ
∨
ψ
)
→DefE: i
Forward
Select an available conditional
Click "Apply"
Backward
Select a goal disjunction with a negated antecedent
Click "Apply"
Preview shown for the
Point And Click
derivation type in the
OLI
system
