Superb for numerical and symbolic work

I am a chemical engineer and have been using this app for over a year and continue to be amazed by its reliability and speed. The analytical engine for differentiation and integration is superb. For more complex work, the full CAS packages such as Maple (my favorite) or Mathematica are appropriate. However, this app suffices for a huge percentage of what I need. Its speed and design are truly outstanding. SUGGESTION: If the developers add the capability for numerical solution of partial differential equations, this would surely become the killer app for engineers and scientists.

UmeshM about Symbolic Calculator, v1.9