Please, fix the asserts. Test case 4 was complaining about an error of 1.136868377216160e-13, which is very close to my machine precision. Unless we want people to use a specific method or technique, we shouldn't request an exact value.
The test suite has been updated with a tolerance rather than requiring exact values.
How to subtract?
Doubling elements in a vector
Generate a random matrix A of (1,-1)
Side of an equilateral triangle
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