Is there a ring such that there are two different ring injections ?

# Month: February 2017

# Finite codimension

Let be Banach (more generally Fréchet) spaces and let be continuous linear maps. Suppose that is surjective and is compact. Prove that has closed image and .

# Still expecting my fix

What’s the expected number of fixed points of a uniformly distributed random permutation of elements?

# Deranged cohomology

[redacted]

# What goes up must come down

Let such that . Prove that .