In the planar Cartesian coordinate system, "Y" (why, the homonym) is up.
In 3D, to include cylindrical coordinate systems, Z is the vertical axis, as OLB "pointed" out.
Back to jokes, but with math-
In 3D, to include cylindrical coordinate systems, Z is the vertical axis, as OLB "pointed" out.
Back to jokes, but with math-
If you get to thinking you’re a person of some influence, try ordering somebody else’s dog around.