Starting from this MWE,
\documentclass[a4paper,12pt]{article} \usepackage{amsmath,amssymb} \usepackage{newtxtext,newtxmath} \begin{document} \[\tilde{\dot{u}}=-i \omega \tilde{u}\] \[\widetilde{\dot{u}}=-i \omega \widetilde{u}\] \end{document} that produces this image:
reading this question, mathabx and mathtools: \widetilde{} and \dot{} problem, I was trying to understand if exists a symbol like \tilde, or \widetilde (without macro) that has more coverage than the u or another letter.
In fact, with the symbol \dot, you can see that \tilde is small and it has little coverage with the letter u. While if I use\widetilde it looks higher, than the dot, but too big in lenght.


