Question 1210549
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If you refer to a diagram, you must either include the diagram, or provide a link to the diagram, 
or describe the diagram accurately, completely and adequately.


If you do not make anything of the above, you violate the laws and rules of mathematical writing,
and also violate the rules of mutual courtesy in written communication.



I am writing it because I know precisely the source of these problems - 
it is the forum/website www.web2.0calc.com, from which such defective posts arrive almost every day.


And I know exactly who stays behind the forwarding of these defective posts - I don't need to explain this.