Difference between Heir Presumptive and Ex Cathedra

HEIR PRESUMPTIVE vs EX CATHEDRA: NOUN

Someone who will inherit only if no better choice for an heir is born.
See heir apparent.
An heir who stands to inherit the estate, title, or office of an intestate ancestor, but whose claim can be defeated if a relative who is closer to the ancestor is born prior to the ancestor's death.
A person who expects to inherit but whose right can be defeated by the birth of a nearer relative

Succession, Peacock throne, Kingship, Dynastic, King, Prince consort, Princeling, Monarch, Figurehead, Prince regent, Coronation, Heir, Successor, Throne, Heir apparent

Equivocally, Canonist, Syllogistic, Presbyters, Nihil, Ineloquent, Sermonise, Jesuitical, Juridically, Ecclesiastical, Inerrant, Cathedra, Papal infallibility, Magisterium, Infallibly

Succession, Peacock throne, Kingship, Dynastic, King, Prince consort, Princeling, Monarch, Figurehead, Prince regent, Coronation, Heir, Successor, Throne, Heir apparent

Equivocally, Canonist, Syllogistic, Presbyters, Nihil, Ineloquent, Sermonise, Jesuitical, Juridically, Ecclesiastical, Inerrant, Cathedra, Papal infallibility, Magisterium, Infallibly

He is the son of Eliwood, the main character of Fire Emblem: The Blazing Blade, and heir presumptive of Pherae.
Frenchman, that he is not heir presumptive to another crown, and that he has previously taken the civic oath.
Prince Albert became King George VI and the young Princess Elizabeth became heir presumptive to the throne.
Known as "The Brat" in the Heraldic Circle, the Heir-presumptive lives up to her nickname.
Roger was made lieutenant of Ireland and was declared heir presumptive to the Crown.

Pope Zephyrinus a weak and venal dunce, and Pope Callistus a sacrilegious swindler, an infamous convict, and an heresiarch ex cathedra.
Thus the term ex cathedra is in practice used in the same context as papal infallibility and faces the same high threshold of application.
Within this concept of papal authority is a teaching that we call ex cathedra, a phrase we use to describe a practice.
It did not explain to all of the world who can know whether or not his statements are ex cathedra, or not.
Maybe the Pope realizes he takes his life into his own hands if he tries to speak Ex Cathedra?
When did ex cathedra and the doctrine of papal infallibility become one and the same thing?
The classes will therefore not take a classical ex cathedra format, but open space up for discussion and debate as well.
To the readers of this review the cardinal speaks ex cathedra.
Ecumenical Council, no ex cathedra statement by a pope.