(math-integrate-by-parts): Do a more careful test to see if equation

can be solved.

1 files changed, 5 insertions, 3 deletions

diff --git a/lisp/calc/calcalg2.el b/lisp/calc/calcalg2.el
index facb691c08b..f71e58e223a 100644
--- a/lisp/calc/calcalg2.el
+++ b/lisp/calc/calcalg2.el
@@ -1253,9 +1253,11 @@
                         (calcFunc-expand temp)
                       (setq v (list 'var 'PARTS math-cur-record)
                             temp (let (calc-next-why)
-                                   (math-solve-for (math-sub v temp) 0 v nil)))
-                      (and temp (not (integerp temp))
-                           (math-simplify-extended temp)))))
+                                   (math-simplify-extended
+                                    (math-solve-for (math-sub v temp) 0 v nil)))
+                            temp (if (and (eq (car-safe temp) '/) 
+                                          (math-zerop (nth 2 temp))) 
+                                     nil temp)))))
            (setcar (cdr math-cur-record) 'busy)))))
 
 ;;; This tries two different formulations, hoping the algebraic simplifier