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Results tagged with mathematics-education
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user 5101
For questions in Mathematics Education as a scientific discipline. For more hands-on questions on teaching Mathematics, please use the tag teaching. There is also a Stack Exchange community http://matheducators.stackexchange.com/
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Anything special (historical?) about surface $x\cdot y\cdot z\ +\ x+y+z=0$?
The corresponding projective surface
$$S: xyz + (x + y + z)w^2=0 \subset \mathbb{P}^3,$$
is a singular cubic surface - singular cubic surfaces are special. It has three singularities, each of which h …
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