And the lecturers mostly express their opinions, it need not be all facts. Right?
Neither of those extremes are correct, actually.
When lecturing, course materials are used to support an agreed curriculum. There is, of course, a different method or emphasis given by each lecturer, but the basic course materials and theories are agreed.
These are not 'facts' in any true sense, but are instead interpretations based on peer-reviewed studies for the most part, although that depends largely on the topic being taught.
'Fact' in the sense that you seem to be using it is basically a word without sense. Anyone claiming to have the 'facts' on any complex set of concepts deserves to be questioned, since that is almost invariably NOT true.
I would ask you to read and consider what I'm saying on this, rather than jumping to a conclusion.
One may try, if one likes, as suggested in Post
#45, no compulsion whatsoever.Please
Regards
The way you tightly define what you would consider proof, and at the same time ignore that this is simply not how language develops (which is a much more organic process than you are crediting it with) makes me wonder if you have your own doubts, and are trying to set up a means to convince yourself you already hold the truth.
You may take that as an insult, I'm not sure, but it's certainly not meant as one. But either you are refusing to think this through, or you're trying to convince yourself, and I'm honestly not sure which at this point.
Consider the following, all of which I would consider 'facts' - as would anyone who has studied language;
1) Words both change meaning, and are 'invented' constantly. Language moves. Constantly. It is, simply put, organic.
2) In terms of a word changing meaning, consider 'nice' which once meant 'silly or foolish' but now means pleasant.
3) In terms of words being invented, consider 'eliminationism', which was not a previously listed word (it relates to fairly extreme political practices)
How exactly does your theory of language fit with these simple facts? People invent words, and people change the meaning of words all the time. Heck, even a cursory glance at the word 'atheist' will tell you that, and you can literally see various parties trying to move or hold the definition on the web on a daily basis.
If you like, you can obviously ignore my points here, and simply state that I am refusing your 'test' as raised in point #45. But I hope that you at least look at the example I've written above and consider it, and consider you own assumptions as well.