8.1.3 Can you answer these questions?

8.1.3.1 how to eliminate these breakpoints when i use Plot3D?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=261558

i tried to plot a picture of a nat comm and found some bugs. how to eliminate the extra lines in the figure i post in the following? 
... 
[plotting]
 

asked by Zhongfu Li https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=84469 1 vote

8.1.3.2 Mathematica and Google Drive

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=261481

My Mathematica notebooks (as well as all other files I author in my research) are in a directory that's part of Google Drive. This automatically backs up everything I create and I don't have any ... 
[notebooks] [save]
 

asked by Wynne https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36616 5 votes

8.1.3.3 Rational numbers in NDSolve

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=261430

Is it possible to use  NDSolve  with  Rational  numbers instead of  Real ? 
I use all rational ... 
[differential-equations] [numerical-integration] [precision-and-accuracy] [arbitrary-precision]
 

asked by amzon-ex https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=80815 2 votes