1) By that very fact 2) Latin legal terminology 
Eo ipso means `by (or from) the thing itself` in Latin and is similar to the sense expressed by the English idioms, `by the same token,` `of itself` or `on its own account`. It is often used in various schools of philosophy to demonstrate the possibility/impossibility of propositions from their nature. For example, `That I am does not eo ...
by that very fact.