This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Hyperbolicparaboloid.svg parabaloid the shape of saddle roof own AndrewHarvey Hyperbolicparaboloid Made with the following source Gnuplot set terminal svg enhanced size set output Hyperbolicparaboloid svg unset key unset xtics unset ytics unset ztics set view set isosamples splot with lines Hyperbolic paraboloids