"formal logic" is too technical for any but well prepared students.
Physiological questions are not to be settled by formal logic.
But this is not the problem with which formal logic is occupied.
(b) formal logic clearly will not quail before the charge of uselessness.
Unless this can be done there is no science of formal logic.
How are modals treated by (a) formal logic and (b) by the theory of induction?
Taken by itself, the Greek argument is a nice piece of formal logic.
Mr. Joseph handles it by formal logic purely, as if he had no acquaintance with the logic of hypothesis at all.
Boole, Jevons, and others have applied the algebraic method not only to formal logic but to political economy.
For reasons of formal logic, too, the idea of progress in the universe is unthinkable.