What is mathematical induction?
A proof technique which exploits the conctruction of the set of natural numbers. In its basic formula it says:

What it basic recursion?
Definining something in terms of itself. In terms of its use in mathematical structures, it usually means using a function in its own definition:

Can variations on induction and recursion have different or multiple base cases?
Yes

What is strong induction?
A refined form of basic induction in which:

Need to do practice on these