I've uploaded the backup to a table, opening the table I see this: Warning in ./libraries/sql.lib.php#601 count(): Parameter must be an array or an object that implements Countable Backtrace ./l...

Possible Duplicate: Count elements for objects implementing ArrayAccess using count()? In PHP 5, you can use magic methods, overload some classes, etc. In C++, you can implement funct...

Trying to do some revision but not sure on this one: Prove that the set of all languages over a finite alphabet is uncountable. I have a feeling it will require using the Cantor Diagonalization...