Is the relationship of extension and generalization between classes the same thing?

Question

OOP

Generalization extension and inheritance relation are three names for one relation?

Answer 1

Extension, generalization, and inheritance are instances of the same "is a" relationship.
In general , inheritance is the repetition by the child class of the structure and functionality of the parent .
Extension is a special case of inheritance, in which the child class not only receives the components of the parent, but also implements its own components.
Generalization is the selection of a common ancestor from several classes, from which you can inherit