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Cleans up a bit

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Joshua Moerman 2015-01-30 12:10:52 +01:00
parent a4f31d1813
commit 29557d1baa
10 changed files with 1 additions and 22 deletions

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@ -1,7 +1,7 @@
\chapter*{Introduction} \chapter*{Introduction}
Homotopy theory is the study of topological spaces and homotopy equivalences. These equivalences are weaker than isomorphism. An isomorphism is given by two maps $f : X \leftadj Y : g$, such that the both compositions are equal to identities. A homotopy equivalence weakens this by requiring the compositions to be homotopic to identities. Some properties of spaces, such as some kinds of connectedness, only depend on the homotopy type. Such properties are homotopy invariants. \todo{not happy with this yet...} Homotopy theory is the study of topological spaces and homotopy equivalences. These equivalences are weaker than isomorphism. An isomorphism is given by two maps $f : X \leftadj Y : g$, such that the both compositions are equal to identities. A homotopy equivalence weakens this by requiring the compositions to be homotopic to identities. Some properties of spaces, such as some kinds of connectedness, only depend on the homotopy type. Such properties are homotopy invariants.
Examples of homotopy invariants are homology groups $H_n(X)$ and homotopy groups $\pi_n(X)$. The latter is defined as the set of continuous maps $S^n \to X$ up to homotopy. Despite the easy definition, the groups $\pi_n(S^k)$ are very hard to calculate and much of it is even unknown as of today. Examples of homotopy invariants are homology groups $H_n(X)$ and homotopy groups $\pi_n(X)$. The latter is defined as the set of continuous maps $S^n \to X$ up to homotopy. Despite the easy definition, the groups $\pi_n(S^k)$ are very hard to calculate and much of it is even unknown as of today.

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@ -122,25 +122,6 @@
\right|_{#2} % this is the delimiter \right|_{#2} % this is the delimiter
}} }}
% Todos in the margin
\newcommand{\todo}[1]{
\addcontentsline{tdo}{todo}{\protect{#1}}
$\ast$ \marginpar{\tiny $\ast$ #1}
}
% Big todos in text
\newcommand{\TODO}[1]{
\addcontentsline{tdo}{todo}{\protect{#1}}
{\tiny $\ast$ #1}
}
% TODO item, as itemize does not work
\newcommand{\titem}[0]{\\-\qquad}
% List of todos
\makeatletter
\newcommand \listoftodos{\section*{Todo list} \@starttoc{tdo}}
\newcommand\l@todo[2]{
\par\noindent \textit{#2}, \parbox{10cm}{#1}\par
}
\makeatother
\theoremstyle{plain} \theoremstyle{plain}
\newtheorem{theorem}{Theorem}[section] \newtheorem{theorem}{Theorem}[section]

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\part{Appendices} \part{Appendices}
\include{chapters/Appendices} \include{chapters/Appendices}
\listoftodos
\bibliographystyle{alpha} \bibliographystyle{alpha}
\bibliography{references} \bibliography{references}