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The Maxima on-line user's manual

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Mainvar

-- Declaration: mainvar You may declare variables to be mainvar. The ordering scale for atoms is essentially: numbers < constants (e.g., %e, %pi) < scalars < other variables < mainvars. E.g., compare expand ((X+Y)^4) with (declare (x, mainvar), expand ((x+y)^4)). (Note: Care should be taken if you elect to use the above feature. E.g., if you subtract an expression in which x is a mainvar from one in which x isnt a mainvar, resimplification e.g. with ev (expr, simp) may be necessary if cancellation is to occur. Also, if you save an expression in which x is a mainvar, you probably should also save x.)

(%o1)                                true
(%i2) 

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