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Discover LudwigThe word 'extendibility' is correct and usable in written English
Specifically, you can use it to refer to the ability to extend either the range or duration of something. For example, "The extendibility of the warranty was the most attractive feature of the product."
Dictionary
extendibility
noun
The condition of being extendible
Exact(2)
Obviously this unbounded extendibility is unphysical, but the definition is still of practical use: it means that anything done on a finite tape, however large, is computable.
With respect to this question, there are some simple models in which one has this kind of extendibility of local solutions to global ones, and some simple models in which one does not have such extendibility, with no clear general pattern.
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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