changed text

Replaced my description of the Chow ring as a cohomology ring with
Max’s description in terms of intersection classes. Wrapped text in a
remark (it ought to be a definition but there are too many things being
defined for that so I just made it a remark).
removed the word cohomology
is to in and arguments to considerations
removed the word cohomology
Added back in the dropped text
combined two paragraphs
made both long tables look alike at headers
removed the word cohomology
removed the word cohomology
replaced cohomology ring with intersection ring
replaced cohomology ring with intersection ring
removed mention of Poincare duality

Could do this since we are working with the intersection ring now
rather than the cohomology ring.
removed the word cohomology
Added intro text to describe int ring
Used int ring rather than H^*
Used A rather than H^*
use A rather than H^*