Add basic support for integral and differential calculus
Some basic integral and differential support would be helpful for day-to-day use.
For example, at the start of the book The Art of Doing Science and Engineering, the author gives us a "back-of-the-envelope" calculation for estimating the percentage of scientists who ever lived and are still alive today. It uses a simple integral to achieve that.
This would also require support for defining custom functions like here: https://soulver.canny.io/feature-requests/p/functions. E.g., the number of scientists at any time, t, can be modelled as y(t) = a × exp(b × t).
Happy to provide more details.
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