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2018-04-12 04:48:11 +0200 answered a question What is the significance of "." other than in a file name?

THANK YOU, THANK YOU!! I'm just starting out using SageMath. Even at this early stage it's been a real time-saver. There are some structures, however, that are confusing and trying to find answers can be difficult. This one is a case in point. I scrolled through the Python codes but I can see I need to invest time in the tutorial(s). Thanks again for pointing towards the resources I'll need.

2018-04-09 09:32:01 +0200 received badge  Student (source)
2018-04-09 09:23:18 +0200 asked a question What is the significance of "." other than in a file name?

I continue to stumble over the "." in structures other than in filenames. For example,

Dr(t) = sol[0].rhs

where D is the first derivative of r and "sol" has been defined as the Sagemath function "solve" in lines before this one.