sagemath-doc-en - 8.6-6 main

SageMath is a free open-source mathematics software system licensed under the
GPL. It builds on top of many existing open-source packages: NumPy, SciPy,
matplotlib, Sympy, Maxima, GAP, FLINT, R and many more. Access their combined
power through a common, Python-based language or directly via interfaces or
wrappers.
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Mission: Creating a viable free open source alternative to Magma, Maple,
Mathematica and Matlab.
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This package contains documentation in English.
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Note that the package for English documentation (sagemath-doc-en) contains far
more documentation than any of the other languages. So if you're finding this
package lacking in content, then you could try that one as well.