Before revision:  In terms of trainingdynamics of deep learning, reproducing activation functions can generate neural tangent kernels  with a better condition number than traditional activation functions lessening the spectral bias of deep learning.
After revision:  In terms of trainingdynamics of deep learning, reproducing activation functions can generate neural tangent kernels (NTKs) with a better condition number than traditional activation functions lessening the spectral bias of deep learning.