
○○○ Ptholemy ⪢⪢
The old idea that the sun moved around the earth is known as the geocentric
theory.
This idea was first made famous by an ancient Greek scientist Ptolomy who lived in Egypt nearly 2000 years ago.
http://qindex.info/i.php?x=13357
• The Poincare Conjecture
In the early 1900s mathematicians and physicists were very interested in the shape of space. New experiments and theories were being developed that would ultimately create relativity
theory and change our entire view of the universe.
http://qindex.info/i.php?x=3533
