The Logic Resource Center
Public Alpha
Systems
Open options
Systems
The Logic Resource Center
Public Alpha
Systems
Open options
Systems
Commutation
Constants
&
∨
Systems
The Logic Book
Start a Problem
→
Commutation
i.
ϕ
&
ψ
ii.
ψ
&
ϕ
Com: i
i.
ϕ
∨
ψ
ii.
ψ
∨
ϕ
Com: i
Forward
Select an available conjunction or disjunction
Click "Apply"
Backward
Select a goal conjunction or disjunction
Click "Apply"
Preview shown for the
Point And Click
derivation type in the
The Logic Book
system
