"outside this class" is a correct and usable phrase in written English.
You can use it when referring to something that does not pertain to or is not within the boundaries of a specified group or situation. For example: "We need to discuss this issue outside this class, as it doesn't pertain to our current lesson."
It's applicable to other things that I work on outside this class.
We then derive an approximate expression for the bias incurred when link functions outside this class are used.
The VKR proteins are largely represented in the class of insects, although the first two examples were discovered outside this class, in the trematode S. mansoni (the parasite responsible for schistosomiasis, the second most important tropical disease after malaria [41]) [6], and in the sea urchin S. purpuratus, and named SmVKR and SpVKR respectively.
Estimation of relative risks processes corresponding to disease rates falling outside this class has, however, received limited attention.
There was no expectation that students would work on their projects outside of this class time though many of them did (per student report).
Since the vast majority of sRNAs physically confirmed to date have been identified in only a few species of γ-proteobacteria, prediction of sRNAs based solely on homology to known sRNAs has yielded relatively few loci outside of this class [4], [5].
And I'm disappointed that they're out of their classrooms, when they could be doing this outside of class time".
You might want to do this outside of class, because the teacher will ask you to stop tearing paper during class.
Certainly on a vehicle in this class, the outside temperature could remain displayed all the time.
However, let the friend know (outside of class!) that this is not meant to insult them; you just need to focus.
Save the socializing for outside of class.
