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Prevent evaluation : quote hold '

A quoted subexpression (either with ' or with the quote or hold) command will not be evaluated.
Remark a:=quote(a) (or a:=hold(a)) is equivalent to purge(a) (for the sake of Maple compatibility). It returns the value of this variable (or the hypothesis done on this variable).
Input :
Output :

giac documentation written by Renée De Graeve and Bernard Parisse