The Induction Scheme Selected for the App Example

(AND (IMPLIES (AND (NOT (ENDP A)) ; Induction Step: test (:P (CDR A) B C)) ; and induction hypothesis (:P A B C)) ; implies induction conclusion. (IMPLIES (ENDP A) (:P A B C))) ; Base Case

The formula beginning with this parenthesis is the induction scheme
suggested by

It is a **conjunction** (`and`

The first is the **induction step** and the second is the **base
case**.