In 1936 the notion of a computable function was clarified by Turing, and he showed the existence of universal computers that, with an appropriate program, could compute anything computed by any other computer. [...] In some subconscious sense even the sales departments of computer manufacturers are aware of this, and they do not advertise magic instructions that cannot be simulated on competitors machines, but only that their machines are faster, cheaper, have more memory, or are easier to program.
It is not that you cannot understand it, it is that you cannot compute it.carlos gershenson
What's done we partly may compute, But know not what's resisted.Robert Burns
The learned compute that seven hundred and seven millions of millions of vibrations have penetrated the eye before the eye can distinguish the tints of a violet.Lytton