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2018-12-01 21:11:35 +0200 received badge  Popular Question (source)
2017-01-05 19:47:54 +0200 asked a question identity matrix

The square root of -1 is represented by I (as well as the usual i). The identity matrix of size n is represented by identity_matrix(n). It seems to me that a better choice would be I(n), but that isn't there. Why is happening here?

2016-06-11 21:21:40 +0200 received badge  Student (source)
2016-06-11 09:38:08 +0200 asked a question numerical_integration returns two numbers. What is the second?

The command numerical_integral returns two numbers. In the documentation, under "numerical integration", the second is called an "error bound", and later on it is called an "error estimate". What is this number, and precisely how is it defined?