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-rw-r--r--src/algebra/strap/DIFRING.lsp5
1 files changed, 2 insertions, 3 deletions
diff --git a/src/algebra/strap/DIFRING.lsp b/src/algebra/strap/DIFRING.lsp
index 2d5ab93c..8777af26 100644
--- a/src/algebra/strap/DIFRING.lsp
+++ b/src/algebra/strap/DIFRING.lsp
@@ -5,10 +5,9 @@
(DEFUN |DifferentialRing;| ()
(LET ((#0=#:G1397
- (|Join| (|Ring|)
+ (|Join| (|Ring|) (|DifferentialDomain| '$)
(|mkCategory| '|domain|
- '(((|differentiate| ($ $)) T) ((D ($ $)) T)
- ((|differentiate|
+ '(((|differentiate|
($ $ (|NonNegativeInteger|)))
T)
((D ($ $ (|NonNegativeInteger|))) T))