--- a/Number.st	Sat Jul 01 19:33:33 2017 +0200
+++ b/Number.st	Sat Jul 01 19:47:34 2017 +0200
@@ -620,6 +620,21 @@
     "
 !
 
+i
+    "return the imaginary unit i"
+
+    
+    ^ Complex real:0 imaginary:1
+
+    "
+     1 + Number i
+     Number i + 10
+     Number i * Number i
+    "
+
+    "Created: / 01-07-2017 / 19:44:53 / cg"
+!
+
 ln10
     "return ln(10) in my representation (and accuracy)."