View source for Xypic/Fibration

<math>
\begin{xy}
%vertices
(27,0)*+{E^{[0]}=B}="v1";(0,20)*+{E^{[1]}}="v2";(70,20)*+{F^{[1]}}="v3";%
(25,35)*+{K\left(\pi_1(F),1\right)}="v4";%
(95,35)*+{K\left(\pi_1(F),1\right)}="v5";%
(0,45)*+{\vdots}="v6";(70,45)*+{\vdots}="v7";(0,70)*+{E^{[n-1]}}="v8";%
(70,70)*+{F^{[n-1]}}="v9";(25,85)*+{K\left(\pi_{n-1}(F),n-1\right)}="v10";%
(95,85)*+{K\left(\pi_{n-1}(F),n-1\right)}="v11";(-20,100)*+{E}="v12";%
(50,100)*+{F}="v13";(0,115)*+{E^{[n]}}="v14";(70,115)*+{F^{[n]}}="v15";%
(25,130)*+{K\left(\pi_{n}(F),n\right)}="v16";%
(95,130)*+{K\left(\pi_{n}(F),n\right)}="v17";
(0,150)*+{\vdots}="v18";(70,150)*+{\vdots}="v19";
{\ar@{->>}^{p_{n+1}} "v18"; "v14"};{\ar@{->>} "v19"; "v15"};%
{\ar@{^{(}->} "v16";"v14" };{\ar@{^{(}->} "v17";"v15" };%
{\ar@{_{(}->} "v15";"v14" };%
{\ar@{->}^{h_{n}} "v12"; "v14"};{\ar@{->}^{h’_{n}} "v13"; "v15"};%
{\ar@{_{(}->} "v13";"v12" };
{\ar@{->>}^{p_{n}}|(.33){\hole} "v14"; "v8"};%
{\ar@{->}^{h_{n-1}} "v12"; "v8"};{\ar@{->}^{h_{1}} "v12"; "v2"};%
{\ar@{->>} "v15"; "v9"};%
{\ar@{->}^{h’_{n-1}} "v13"; "v9"};{\ar@{->}_{h’_{1}} "v13"; "v3"};%
{\ar@{_{(}->} |(.18){\hole} "v9";"v8" };%
{\ar@{^{(}->} "v10";"v8" };%
{\ar@{^{(}->} "v11";"v9" };
{\ar@{->>} "v8"; "v6"};{\ar@{->>} "v9"; "v7"};%
{\ar@{->>} "v6"; "v2"};{\ar@{->>} "v7"; "v3"};%
{\ar@{^{(}->}|(.35){\hole} "v4";"v2" };%
{\ar@{^{(}->} "v5";"v3" };
{\ar@{->}"v8"; "v1"};%
{\ar@{_{(}->}|(.725){\hole} "v3";"v2" };
{\ar@{->>}_{q_1=p_1}"v2"; "v1"};%
\end{xy}
</math>