Anti Particles
Intuitive
https://paul.physicsnotes.org/doku.php?id=distillery:cpv
Concrete
https://profmattstrassler.com/articles-and-posts/particle-physics-basics/particleanti-particle-annihilation/
http://physics.stackexchange.com/questions/391/is-anti-matter-matter-going-backwards-in-time?rq=1
Abstract
The motto in this section is:
the higher the level of abstraction, the better
.
Why is it interesting?
FAQ
Is anti-matter matter going backwards in time?
see
https://physics.stackexchange.com/questions/391/is-anti-matter-matter-going-backwards-in-time