diff --git a/definition.py b/definition.py
index e133b08fae6a7f90728af3be0cf6acf646fa0479..13af14aa8d0fb0f394388dd9891a3fdd9e2c8f41 100644
--- a/definition.py
+++ b/definition.py
@@ -19,14 +19,6 @@ class Plate:
         self.theta = theta
         self.orientation = orientation
 
-def coef(real, imag):
-    a = 0
-    if real != 0:
-        a = real
-    if imag != 0:
-        a+= imag*1j
-    return(a)
-
 class Photon:
     def __init__(self, state0, state1):
         self.state0 = [state0]