Mike Boyle

Add github actions CI

3

This PR attempts to replicate the CircleCI workflow (which is not working as of this writing) in github actions. It also removes references to CircleCI. It also fixes a few...

As mentioned [here](https://github.com/pygae/galgebra/pull/487#discussion_r1294152107) the tests currently run on sympy 1.7; as of this writing, the current sympy version is 1.12, and the tests fail on it. When I removed the...

Poor accuracy of `cos` just below pi with Double64

3

For values close to — but just below — pi, the result of `cos` is quite jittery and significantly less accurate than values just *above* pi. I actually don't understand...

Complex + dualcache

3

Nowadays ForwardDiff seems to work nicely when using Complex (internally, at least), so I was trying to use `dualcache` with a complex array. Unfortunately, it seems like [the more interesting...

As mentioned in issue #12, the calculations suddenly get very bad for ell>29. I also noticed that the errors are growing exponentially from low ell, for certain rotations. I've replaced...

D^\ell_{m',m} (0, \pi, 0) = (-1)^{\ell+m'} \delta_{m',-m} = (-1)^{\ell-m} \delta_{m',-m} Similarly, test e^{-i m \alpha} behaviors.

Include new spin-quadratic terms

1

http://arxiv.org/abs/1501.01529

At some point, `S_ell` were not time dependent. Make sure they are appropriately suited to the system now.

Somewhere in the spin precession notebook (and possibly elsewhere), I swap variables by using `subs` in an ugly way with intermediate dummy variables. But `subs` actually takes a keyword argument...