"non applicability" is correct and usable in written English.
You can use it when something does not apply to a certain situation. For example, "This policy does not apply in cases of non applicability."
(a) Due to non-applicability of an item or a not-applicable sub-item.
In 1968 the UN General Assembly adopted a Convention on the Non-applicability of Statutory Limitations to War Crimes and Crimes Against Humanity.
For the range of non-applicability of the capillary approach, we develop here a model based on flow around submerged objects.
All sources with modification projects with increases in Ammonia emissions that are not subject to Section IV of this Ruling must maintain records of the non-applicability of Section IV that reference the definition of "significant" for Ammonia that is established by the reviewing authority in the nonattainment area where the source is located.
These results indicate the non-applicability of themodel.
In particular, the non-applicability of reduction coefficients in case of partial retirement is one of the main determinants of the use of this figure.
In order to assist machine learning algorithms differentiate missing values due to non-applicability and missing values due to survey issues, multi-part questions that disqualify future answers are typically converted to a 0 or −1 (depending the context).
Thus, the non-applicability of reduction coefficients in case of partial retirement before the ordinary age of retirement is one of the main determinants of the use of this figure.
Huang (2007: 40) reverses the ordering, saying that "the R-principle generally takes precedence until the use of a contrastive linguistic form induces a Q-implicature to the non-applicability of the pertinent R-implicature…." This makes it hard to explain why (7) has a Q implicature, or how (9) could have both a Q and an R implicature.
There are perhaps two sources of worry here: first, that this approach invites a confusion between metaphysics and epistemology; and secondly (but relatedly) that contexts governed by the conjunction "because" are opaque (in the technical sense of the term, in which it implies the non-applicability of Leibniz's Principle of the Identity of Indiscernibles).
