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-rw-r--r--src/algebra/sf.spad.pamphlet2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/algebra/sf.spad.pamphlet b/src/algebra/sf.spad.pamphlet
index fc01b769..c64c6cba 100644
--- a/src/algebra/sf.spad.pamphlet
+++ b/src/algebra/sf.spad.pamphlet
@@ -506,6 +506,8 @@ DoubleFloat(): Join(FloatingPointSystem, DifferentialRing,
x ** (n::% / d::%)
nan? x == %fNaN? x
+ opposite?(x,y) == x = -y
+ annihilate?(x,y) == zero? x or zero? y
@
\section{License}