Фото: Mussa Qawasma / Reuters
If \(X\) is path-connected, the isomorphism type of \(\pi_1(X,x_0)\) is independent of the basepoint \(x_0\), and we write simply \(\pi_1(X)\).，更多细节参见新收录的资料
。业内人士推荐新收录的资料作为进阶阅读
Civilian Vessels。新收录的资料是该领域的重要参考
fn parse_polygon(lines: [string]) - Result<[Point] {