Replacement Math

https://docs.google.com/presentation/d/1MPC0XR_YI46-TEJKEDCKXhvRwtwRGvkHlzKnd77UddA/edit#slide=id.gff4d45db4f_0_10

Core Support 

https://docs.google.com/presentation/d/11tUw_CEQa5SGRWckZlgElOS7CgKgA49pBnSgK04Jzpk/edit?usp=sharin