These properties of the projection map are used to obtain inverse and implicit function theorems for associated normal maps, using a new characterization of invertibility of a $ {\rm PC}^ {1}$ ...

Pan Fang, Kexin Wang, Liming Dai, Chixiang Zhang, Numerical calculation for coupling vibration system by Piecewise-Laplace method, Science Progress (1933-), Vol. 103, No. 3 (2020), pp. 1-28 ...