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Aug 22 at 11:42 comment added Lucenaposition Similarly, any $\Sigma_1$ arithmetical statement that is true can be easily proven to be true.
Aug 7 at 7:02 comment added Martin Sleziak This was given also as one of the answers here - with some examples: Can you give an example of a complex math problem that is easy to solve? (Posted by Keith Conrad.)
S Jul 30 at 4:13 history answered Lucenaposition CC BY-SA 4.0
S Jul 30 at 4:13 history made wiki Post Made Community Wiki by Lucenaposition