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-rw-r--r--chickadee/math.scm4
1 files changed, 2 insertions, 2 deletions
diff --git a/chickadee/math.scm b/chickadee/math.scm
index c61b862..9286fe4 100644
--- a/chickadee/math.scm
+++ b/chickadee/math.scm
@@ -18,7 +18,7 @@
(define-module (chickadee math)
#:export (pi
pi/2
- 2pi
+ tau
cotan
clamp
min
@@ -30,7 +30,7 @@
(define pi 3.14159265358979323846)
(define pi/2 (/ pi 2.0))
-(define 2pi (* pi 2.0))
+(define tau 6.283185307179586) ;; AKA 2pi
(define-inlinable (cotan z)
"Return the cotangent of Z."