Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Consider the strip $\{x+iy: -1\leq x < 1 , y>1/2\}$ in the complex upper half plane and let $\lambda$ be the usual $\Gamma(2)$-invariant modular function on the complex upper-half plane.

Question. Can one show that the unit circle lies in $$\lambda(\{x+iy: -1\leq x < 1 , y>1/2\})?$$

share|cite|improve this question
You wrote $1\leq x <1$. I'm sure that's not what you meant. – Rasmus Oct 21 '11 at 7:46
There are still some $1$s that should be $-1$s. – Rasmus Oct 21 '11 at 11:22

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.