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Changeset 377 for branches/f4grobner


Ignore:
Timestamp:
2015-06-06T17:59:29-07:00 (10 years ago)
Author:
Marek Rychlik
Message:

* empty log message *

File:
1 edited

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  • branches/f4grobner/term.lisp

    r186 r377  
    7777                         (term-coeff term)))
    7878          p))
     79
     80(defun term-mul (ring term1 term2)
     81  "Returns the product of the terms TERM1 and TERM2,
     82or NIL when the product is 0. This definition takes care of divisors of 0
     83in the coefficient ring."
     84  (let ((c (funcall (ring-mul ring) (term-coeff term1) (term-coeff term2))))
     85    (unless (funcall (ring-zerop ring) c)
     86      (list (make-term (monom-mul (term-monom term1) (term-monom term2)) c)))))
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