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-rw-r--r--src/algebra/si.spad.pamphlet2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/si.spad.pamphlet b/src/algebra/si.spad.pamphlet
index f620c59f..605f78e5 100644
--- a/src/algebra/si.spad.pamphlet
+++ b/src/algebra/si.spad.pamphlet
@@ -81,7 +81,7 @@ IntegerNumberSystem(): Category ==
-- commutative("*") -- follows from the above
add
- characteristic() == 0
+ characteristic == 0
differentiate x == 0
even? x == not odd? x
positive? x == x > 0