Since 1800 B.C. mathematicians have worked on the problem of constructing a square equal in area to that of a given circle. |
Other inventions which Papin worked on were the construction of a submarine, an air gun and a grenade launcher. |
In astronomy he worked on making observations more precise by improving astronomical instruments. |
He seems to have worked on road gangs for a time and in a shoe repair factory before rheumatism forced him to quit. |
I worked on that because in crucial matches it's very important not to bowl no-balls and wides. |
He also worked on asymptotic analysis, fractional integration and singular partial differential equations. |