diff --git a/src/Math-Core/PMVector.class.st b/src/Math-Core/PMVector.class.st
index 9a015f0ee..9185fd96e 100644
--- a/src/Math-Core/PMVector.class.st
+++ b/src/Math-Core/PMVector.class.st
@@ -20,7 +20,7 @@ Class {
 	#name : #PMVector,
 	#superclass : #Array,
 	#type : #variable,
-	#category : #'Math-Core'
+	#category : 'Math-Core'
 }
 
 { #category : #'instance creation' }
@@ -308,15 +308,6 @@ PMVector >> sqrt [
 	1 to: self size do: [ :n | self at: n put: (self at: n) sqrt ]
 ]
 
-{ #category : #transformation }
-PMVector >> sum [
-	"Compute the sum of a vector."
-	|a|
-	a := 0.
-	1 to: self size do: [ :n | a := a + self at: n].
-	^a.
-]
-
 { #category : #operation }
 PMVector >> tan [
 	"Apply tan function to every element of a vector"
diff --git a/src/Math-Core/PMWeightedPoint.class.st b/src/Math-Core/PMWeightedPoint.class.st
index 68a6f6146..a7beea989 100644
--- a/src/Math-Core/PMWeightedPoint.class.st
+++ b/src/Math-Core/PMWeightedPoint.class.st
@@ -12,7 +12,7 @@ Class {
 		'weight',
 		'error'
 	],
-	#category : #'Math-Core'
+	#category : 'Math-Core'
 }
 
 { #category : #creation }