FUNCTION: weakly_positive - test a unitform for weak positivity

CALLING SEQUENCE:
weakly_positive(q)
weakly_positive(q,rt)

PARAMETERS:
q - a unit form
rt - an optional parameter evaluating to a name

SYNOPSIS:

EXAMPLES:

> p:=[4,{[1,2,3],[4,1]}];

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> q:=titsform(p);

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> weakly_positive(q,'rt');

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> print(rt);

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SEE ALSO: unitform, weakly_nonneg, titsform, titsform_p

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