I find that quality on technical and mathematical subjects varies wildly. I remember once looking up a very specific topic, just to be sure that I don't misrem

I find that quality on technical and mathematical subjects varies wildly. I remember once looking up a very specific topic, just to be sure that I don't misremember a certain simple but crucial core relation. What I found was a page that was so shockingly disorganised that I had to wade through 5 pages of mindbendingly complexified, quasi-obscurantist... drivel... just to extract that central piece of information that really should have been mentioned in the bit above the TOC, or at least easy to find. So, YMMV.