it is reasonable to ask the OP to clarify this, as you have done in comments. i would vote to close in its current form as lacking context. even if "everybody knows" what those symbols mean (and guess what, they don't), the OP saying what they are and what they know about them is part of setting the stage for the problem.
in an ideal world the OP would even explain what a 'p-solvable group' is although this is getting to the level where if you are capable of answering the question you probably know already. the point is to relieve potential answerers of the burden of assuming that you know things that maybe you don't.
the last thing anyone wants to do is respond to a question like this and then get a response "wait, why is that true?" and it's buried in the definitions of one of the things OP assumed without comment.
