Certain deeper questions, however, which arise not only from a linguistic outset but also from a physical end, enforce conceptualization of a full phenomenon of language (i.e., not of fragments of it like an easily seen grammar, etc). What then results is a holistic, comptementaristic conception of language, which encompasses particular species like genetic language, programming languages, formal languages, cerebral languages, and external communication languages.
Starting out from a holistic end, we have obtained the following views of a linguistic complementarity, namely:
2) as a tension between describability and interpretability within a language;
3) as degrees of partiality of self-reference (introspection) within a language: complete self-reference within a language is impossible;
4) as a principle of "non-detachability of language".
We have previously been able to relate the linguistic complementarity with Bohr's primary view of complementarity in quantum mechanics, namely as a tension between definability and observability. Now, the question if, and how, the endo-physical scheme can be compared with the views of the linguistic complementarity is considered in terms of a reducibility concept which allows reduction between complementaristically conceived entities.
An associated problem is whether information, in its full-fledged linguistic sense, can be reduced into a physical concept. To that end we suggest how information types are to be related with degrees of partiality of self-reference. We illuminate a recent question concerning algorithmic information theory and Gödel incompleteness.