Question 1194817
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Hello, I have lived in the world for many years and saw many different ways 
to define the domain of a function, but never saw this way to write the domain as you use, like ]1;10[.



What does it mean this mysterious designation: open interval (1,10) with excluded endpoints or, 
in opposite, everything OUTSIDE of this interval ?



And another question: why do you use non-standard notification, which is NEVER used in Math,

and, in addition, introduce it without any explanations ?



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        Doing this way is standardly considered in Math
                        as a Math crime.

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Usually, when the problem comes with non-standard and UNDEFINED designation, it ONLY deserves to be 
returned to its author with a notification from a reader - - -  it is a standard way to react on such parcels.



Writing accurately is a form of mathematical politeness.