Brain Teasers User Profile
Anas Diab
rank
58

points
215


See full ranking list


short ranking list

Christian GoldbachBorn 18 Mar 1690; died 20 Nov 1764 at age 74.Russian mathematician whose contributions to number theory include Goldbach's conjecture, formulated in a letter to Leonhard Euler dated 7 Jul 1742. Stated in modern terms it proposes that: "Every even natural number greater than 2 is equal to the sum of two prime numbers." It has been checked by computer for vast numbers  up to at least 4 x 1014  but still remains unproved. Goldbach made another conjecture that every odd number is the sum of three primes, on which Vinogradov made progress in 1937. (It has been checked by computer for vast numbers, but remains unproved.) Goldbach also studied infinite sums, the theory of curves and the theory of equations.«[Image: Letter to Euler, in which Goldbach presented his conjecture.] 
Senior Citizen
Two businessmen in Florida were sitting down for a break in their soontobe new store. As yet, the store wasn't ready, with only a few shelves set up. One said to the other, ' I bet any minute now some senior citizen is going to walk by, put his face to the window, and ask what we're selling.'
No sooner were the words out of his mouth when, sure enough, a curious senior citizen walked to the window, had a peek, and in a soft voice asked
"What are you sellin' here?"
One of the men replied sarcastically, "We're selling assh*les."
Without skipping a beat, the old timer said, "You're doing well. Only two left."