Hey,
Let F be any field and let I = F[[x]] \ F[[x]]* be the set of non-units in F[[x]].
Show that I is an ideal of F[[x]].
this question is troubling me as i cannot seem to properly define what I is, can someone please explain I to me?
Cheers
Hey,
Let F be any field and let I = F[[x]] \ F[[x]]* be the set of non-units in F[[x]].
Show that I is an ideal of F[[x]].
this question is troubling me as i cannot seem to properly define what I is, can someone please explain I to me?
Cheers