一道数学题：x^2 + y^2 = -1what kind of curve does this equation describe in plane?
(one of my CFM tutorial questions)
thank you!
[mean (4-2 19:54, Long long ago)] [ 传统版 | sForum ][登录后回复]1楼

My try ...if the plane refers to the x-y plane, then it implies x and y must be rea, hence the equation describe no graph in the plane.

If the plane refers to the complex plane, you can try substituting the two variables by Im and Re. [XiAoMo (4-2 22:08, Long long ago)] [ 传统版 | sForum ][登录后回复]2楼