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Hello Haiopaio,
where may i post my question? Thank you in advance.

Hello to everybody,
i'm a new latex user. I'm new in this latex forum.
I'm a math italian teacher. I bought the Stefan good book in august last year.
I'm now exploring the math tikz library (\usetikzlibrary{math}). I found a good for me
documentation of the calc library in the book. Unfortunately ...