December 30, 2013
#1310: Goldbach Conjectures explain

[Six small panels with captions are arranged in an arch shape:]
[Caption under the arch:]
Goldbach Conjectures
[Captions in the panels, from left to right:]
Extremely weak:
Numbers just keep going
Very weak:
Every number greater than 7 is the sum of two other numbers
Weak:
Every odd number greater than 5 is the sum of three primes
Strong:
Every even number greater than 2 is the sum of two primes
Very strong:
Every odd number is prime
Extremely strong:
There are no numbers above 7