conversion from string to double in some cultures is not valid

[sergey]

Correction: File XmlUtilities.cs line 45 replace with the next
return double.Parse(attribute.Value, CultureInfo.InvariantCulture);
Turn on Globalization namespace. (using System.Globalization;)

[Friedrich von Never (friedrich-v)]

Hello. Please note that we've fixed the issue in our project fork: https://github.com/ForNeVeR/wpf-math/pull/7