Possible Duplicate:
Application of Seifert-van Kampen Theorem
Let $X$ be as in the following figure. What is the first fundamental group, $\Pi_1 (X)$, of $X$? What are the covering spaces of $X$?
X">
Possible Duplicate:
Application of Seifert-van Kampen Theorem
Let $X$ be as in the following figure. What is the first fundamental group, $\Pi_1 (X)$, of $X$? What are the covering spaces of $X$?
X">