/sci/ - Science & Math

>>12311737
Hint hint:
If [math]X[/math], an arbitrary topological space, has a continuous surjection to [math]Y[/math], [math]Y[/math] is also compact.
>>12312459
All the automorphisms are linear maps [math]\mathbb{Z} \rightarrow \mathbb{Z}[/math]. Those are, I'll mention, two by two matrices. There is a shitty explicit formula for a two by two matrix's inverse. Google it.