# evaluating the $U^\dagger U$ of an unitary matrix does not work

```
mat = matrix([[0,1],[1,0]]) #creates a pauli matrix
u = exp(i*mat)# creates an unitary matrix
print ((u.H)*u).n() # u*u evaluated numerically
```

$U^\dagger U$ does not return the identity. why?

sage output-

[4.44305526025399e6 4.44305526025388e6]

[4.44305526025388e6 4.44305526025399e6]

the weirdest thing - it works now! hmm .. i was using the sagenb.org worksheet interface. thanks!