> Actually, only mainspace is encyclopedic, and therefore blogposts can be considered as external sources relatively the mainspace, aren't they?
I agree with it, because in my opinion, we are not considering our blog posts as portions of encyclodia, which need to include external sources. (If many of us considered so, then there would not be so many incorrect resuls in blog posts without sources.) As far I understand, we are writing blog posts for our own perpose under reasonable restrictions, e.g. we should not write blog posts which are completely irrelevant to googology.
In order to clarify, I add my opinion that blog posts can be reasonable external sources only when they are first sources. For exameple, the blog post on a number N originally defined there is the first source of the number N. On the other hand, if a blog post refers to an existing number X and includes the author's unsourced/unverified results such as "X is smaller than Y in my analysis", then it should not be an external source, because we can make up any such meaningless "sources". Of course, it can be the first source of the fact "A wiki user A stated that X is smaller than Y without any reasoning" or something like that.
Also, I am sorry about this issue, because you have already made external sources in your website on your great works. (Since mathjax in FANDOM is not necessarily compatible with other websites, I guess that it was perhaps tiresome.)