Depends on what level of detail you're interested in. You could check out ADA/Spark or Dafny. Or, investigate something like Isabelle/HOL or Coq - perhaps via h

Depends on what level of detail you're interested in. You could check out ADA/Spark or Dafny. Or, investigate something like Isabelle/HOL or Coq - perhaps via http://concrete-semantics.org/ http://concrete-semantics.org/ or http://adam.chlipala.net/cpdt/ http://adam.chlipala.net/cpdt/.