It is a countable noun because we can count computers
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One way to prove that the set of all languages that are not recursively enumerable is not countable is by using a diagonalization argument. This involves assuming that the set is countable and then constructing a language that is not in the set, leading to a contradiction. This contradiction shows that the set of all languages that are not recursively enumerable is uncountable.
No, "np" is not a countable noun.
every one can use a computer but if you really want to you can sing (copy me) what can do computer? who can do computer? computer looter looter looter looter! yah computer!
It is computer knowledge or knowledge about computer
Yes, computer engineers teaches computer classes.