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Discover LudwigThe word "effectivity" is a valid, usable word in written English.
Generally, you would use "effectivity" when you want to refer to how effectively something works. For example, "The new software upgrade has drastically improved the effectivity of the computer system."
Dictionary
effectivity
noun
The ability or power to be effective.
Exact(4)
Desire desires a single effect to the exclusion of any other effect; but the denial of effectivity for any single cause also implies that what is produced by any causal process can never be only a single effect.
The accelerant for that scramble was the so-called Principle of Effectivity, agreed to in Berlin: Even within their agreed sphere of influence, the colonizing powers needed to establish treaties with local overlords, install local administrations, police the area and develop it economically.
However the effectivity of HBT can be called into question, as within RUSS the existence of ε-singular covers (see Section 3.2 above) provides a strong recursive counterexample to the theorem.
In fact, the results and proofs in BISH can be interpreted, with at most minor amendments, in any reasonable model of computable mathematics, such as, for example, Weihrauch's Type Two Effectivity Theory (Weihrauch 2000; Bauer 2005).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com