An inverse function graphing calculator will allow you to graph functions quickly and precisely, which will help you visualize how these graphs behave.

Malgorzata Przenioslo, Images of the Limit of Function Formed in the Course of Mathematical Studies at the University, Educational Studies in Mathematics, Vol. 55, No. 1/3 (2004), pp. 103-132 ...

We estimate the expected number of limit cycles of a planar polynomial vector field situated in a neighbourhood of the origin provided that the field in a larger neighbourhood is close enough to a ...