ams,ath is accually quite important

src/HsH-report.cls

@@ -75,6 +75,7 @@
 \RequirePackage{babel} % required for german names
 \RequirePackage{hyperref} % references and lists are clikable
 \RequirePackage{bookmark} % generat bookmarkes
+\RequirePackage{amsmath} % a lot of nice Math
 \RequirePackage{scrlayer-scrpage} % required for header and footer
 \RequirePackage{scrhack} % compatability with listings
 \RequirePackage{csquotes} % quotations

src/HsH-standalone.cls

@@ -68,6 +68,7 @@
 \RequirePackage{lmodern} % font
 \RequirePackage{graphicx} % required for importing images
 \RequirePackage{babel} % required for german names
+\RequirePackage{amsmath} % a lot of nice Math
 \if@german\RequirePackage{ziffer}\fi % german dezimal numbers
 
 % typesetting indexes upright or standart