Wikipedia:Reference desk/Archives/Mathematics/2010 June 2

= June 2 =

weakly normalised
In some articles like this there are some assumptions that a function need to be weakly normalised. I didn't found any explanation for this. What it is mean? (This is not about something of Lambda calculus) --77.124.146.172 (talk) 05:34, 2 June 2010 (UTC)

closed immersion of smooth varieties
If X, Y are smooth varieties and f: X -> Y is a closed immersion, is f(X) smooth? In Liu, it is proved that it is a regular immersion, so the answer seems to be "no", but what is a counterexample? Ringspectrum (talk) 17:12, 2 June 2010 (UTC)