Dva Mu

Some articles on mu, dva mu:

Czech Language - Syntax and Morphology - Declension - Counting and Declension
... a typical Slavic counting system, explained as follows with the example masculine animate noun muž (man) For the number one, the singular number is used jeden muž ... may be used, depending on the function of the noun in the sentence dva muži (nominative) ... "Vidím dva muže" (accusative) ...