Argument checks

src/Numerics/Distance.cs

@@ -427,7 +427,7 @@ namespace MathNet.Numerics
                 throw new ArgumentException(Resources.ArgumentVectorsSameLength);
             }
 
-            if ((a.Length == 0 && b.Length == 0) || (a == null && b == null))
+            if (a.Length == 0 && b.Length == 0)
             {
                 return 0;
             }
@@ -473,7 +473,7 @@ namespace MathNet.Numerics
                 throw new ArgumentException(Resources.ArgumentVectorsSameLength);
             }
 
-            if ((a.Length == 0 && b.Length == 0) || (a == null && b == null))
+            if (a.Length == 0 && b.Length == 0)
             {
                 return 0;
             }

src/Numerics/Optimization/NelderMeadSimplex.cs

@@ -113,7 +113,7 @@ namespace MathNet.Numerics.Optimization
             if (initialGuess == null)
                 throw new ArgumentNullException("initialGuess", "initialGuess must be initialized");
 
-            if (initialGuess == null)
+            if (initalPertubation == null)
                 throw new ArgumentNullException("initalPertubation", "initalPertubation must be initialized, if unknown use overloaded version of FindMinimum()");
 
             SimplexConstant[] simplexConstants = SimplexConstant.CreateSimplexConstantsFromVectors(initialGuess,initalPertubation);

src/Numerics/Providers/LinearAlgebra/ManagedLinearAlgebraProvider.Complex.cs

@@ -70,11 +70,6 @@ namespace MathNet.Numerics.Providers.LinearAlgebra
                 throw new ArgumentException(Resources.ArgumentVectorsSameLength);
             }
 
-            if (y.Length != x.Length)
-            {
-                throw new ArgumentException(Resources.ArgumentVectorsSameLength);
-            }
-
             if (alpha.IsZero())
             {
                 y.Copy(result);