Evolutoids and pedaloids of frontals on timelike surfaces
In this article, we fifty fifty truckee define evolutoids and pedaloids of frontals on timelike surfaces in Minkowski 3-space.The evolutoids of frontals on timelike surfaces are not only the generalization of evolutoids of curves in the Minkowski plane but also the generalization of caustics in Minkowski 3-space.As an application of the singularity