To Sir, with Love: How To Get More Women Involved in Open Source (O'ReillyNet)

To Sir, with Love: How To Get More Women Involved in Open Source (O'ReillyNet)

I guess working with unproved assumptions might get you such an impression

Oh no, not in math. People work with unproved assumptions all the time, since most important assumptions happen to be very difficult to prove. However, your unproven assumption should be well established.

What's more likely the case is that a new name ("his sister") triggers some more sceptical view. Mathematicians don't treat newbies lightly, as well. If you have an established reputation, and people of the same field probably know you in person, it's easier to get a paper passed.