... as in [tex]\bold{R}^2[/tex]\[tex]\{\bold{0}\}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

Used in context here http://books.google.com/books?id=4Y...hsjnCQ&sa=X&oi=book_result&resnum=1&ct=result top of the page.

I've previously seen the notation [tex]\bold{R}^2-\{\bold{0}\}[/tex] for the cartesian plane with the origin excluded, so I hesitated to assume that the above notation meant the same thing.

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# What does the \ symbol mean, please?

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