A pure and applied mathematician are asked to calculate 2 * 2.
The applied mathematician’s solution:
We have,
2 * 2 = 2 *1/ (1-1/2).
The second factor on the right hand side has a geometric series expansion
1/(1-1/2) = 1 + 1/2 +1/4 + 1/8 + ….
Cutting off the
