I dunno, about 20 or 30. I have a huge killfile, I don’t want tweets from
morons like Pig Dog so I never see as many messages as you. There are 
other newsgroups more interesting than this one to waste my time on.
 
In any case the circularity is contained in the phrase
“If with the help of the equations of transformation developed in § 3” 
Look, 
sqrt(1-v^2/c^2)  = sqrt( c^2/c^2  - v^2/c^2)  because c^2/c^2 = 1
Now we have a common divisor, c^2, so
sqrt( c^2/c^2 - v^2/c^2) = sqrt( [c^2 - v^2] /c^2) 
c^2-v^2 is the difference of two squares and equals (c+v)(c-v) so
sqrt(1-v^2/c^2) = sqrt( (c+v)* (c-v) / c^2) 
but the addition c+v doesn’t exist because the velocity of light c
cannot be altered by composition with a velocity less than that of light, 
so  sqrt(1-v^2/c^2) = sqrt(c * c / c^2) = 1. 
The composition of velocities invalidates the equations of transformation 
developed in § 3 and Einstein was as deranged as Peter Webb or Pig Dog 
or Humpty Roberts or Dork Van de faggot or papabozo who are not 
killfiled as their stupidity and gross incompetence at simple schoolboy 
algebra makes me laugh, whereas the transvestite Tom&Jeery/Minor 
Crank/ or whatever new name it invents is equally stupid but 
writes more than a tweet and is killfiled. I leave the cretin to you, when
you agree with a fool the guarantee is he’s doing the same.
Carpe diem but fish for marlin, forget the carp and sardines 
-- This message is brought to you from the keyboard of 
Lord Androcles, Zeroth Earl of Medway