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$\begingroup$ A second, pragmatic reason for choosing P is that it is closed under addition, multiplication and exponentiation with constants. This is convenient when composing algorithms/machines; if the building blocks are efficient, so is the result. $\endgroup$
– Raphael
Commented Mar 11, 2012 at 11:36
$\begingroup$ I'm just curious, does anyone know whether the term "galactic algorithm" is ever used in practice? $\endgroup$
– Juan Bermejo Vega
Commented Mar 11, 2012 at 20:21
$\begingroup$ It's not that old a term. But I've started using it :) $\endgroup$
– Suresh
Commented Mar 11, 2012 at 23:46

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