Fix incorrect description of Hestenes inner product in examples

[utensil]

In https://nbviewer.jupyter.org/github/pygae/galgebra/blob/master/examples/ipython/inner_product.ipynb :

It's inconsistent with implementation and the original literature:

This should be corrected. And it's better to add some description of all three definitions:

from Geometric Algebra with Applications in Science and Engineering .

[eric-wieser]

It's inconsistent with implementation and the original literature

How so? Looks identical to the implementation and literature to me, if you start with the assumption that r and s are non-negative

[utensil]

This is particularly wrong (my own mistake). And the formula fails to mention how it should be like for arbitrary multivectors (i.e. the summing).

[eric-wieser]

Apart from the out of place "of", that sentence is true, isn't it?

And the formula fails to mention how it should be like for arbitrary multivectors

That's fair.

It might be worth adding the mathematical description to the docstring of hestenes_dot

[utensil]

Apart from the out of place "of", that sentence is true, isn't it?

No. It intended to describe how it works, not a consequence of how it works.