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\title{First theorems of Predicate Calculus}
\author{Michael Meyling}
\date{\tt <module@qedeq.org>}


\begin{document}

\maketitle

\setlongtables



{\small
This document is part of the project ``Hilbert II''.
To get more information about this project look at:\\
\mbox{\url{http://www.qedeq.org}}.


Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no
Back-Cover Texts. See also under \url{http://www.gnu.org/copyleft/}
}


\section*{Abstract}

This module includes first proofs of predicate calculus theorems.


\section*{Specification}

This document has the following specification:

\begin{longtable}[h!]{l@{\extracolsep{\fill}}p{12cm}}
Name: & predtheo1 \\
Version: & 1.00.00 \\
Rule version: & 1.00.00 \\
Orgin: & \url{http://www.qedeq.org/0_00_53/predtheo1_1.00.00_1.00.00.qedeq} \\
\end{longtable}

\medskip

Author of this module: 
\begin{longtable}[h!]{l@{\extracolsep{\fill}}l}
Michael Meyling & mime@qedeq.org \\
\end{longtable}




\section*{References}

This document uses the results of the following documents:

\begin{longtable}[h!]{l@{\extracolsep{\fill}}p{12cm}}
Name: & propaxiom \\
Version: & 1.00.00 \\
Rule version: & 1.00.00 \\
Orgin: & \url{propaxiom_1.00.00_1.00.00.qedeq}  \\
pdf: & \url{propaxiom_1.00.00_1.00.00.pdf}  \\
Name: & predaxiom \\
Version: & 1.00.00 \\
Rule version: & 1.00.00 \\
Orgin: & \url{predaxiom_1.00.00_1.00.00.qedeq}  \\
pdf: & \url{predaxiom_1.00.00_1.00.00.pdf}  \\
\end{longtable}


\section*{Content}




First we prove a simple implication:




\begin{thm}[theo1]
\hypertarget{theo1}{}
\begin{displaymath}
\exists x\, R(x)\ \rightarrow \  \neg \forall x\, \neg R(x)\end{displaymath}
\end{thm}
\begin{proof}
\mbox{}\\
\begin{longtable}[h!]{r@{\extracolsep{\fill}}p{9cm}@{\extracolsep{\fill}}p{4cm}}
\label{theo1:1}
  $1$ & $\forall x\, R(x)\ \rightarrow \  R(y)$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule2}{add axiom} \hyperref{predaxiom_1.00.00_1.00.00.pdf}{}{axiom5}{axiom5} } \\
\label{theo1:2}
  $2$ & $\forall x\, \neg R(x)\ \rightarrow \  \neg R(y)$
  & {\tiny \hyperref{predaxiom_1.00.00_1.00.00.pdf}{}{predrule3}{replace}  $R(@S_{1})$ by $\neg R(@S_{1})$ in \hyperref[theo1:1]{$1$}
} \\
\label{theo1:3}
  $3$ & $\neg \forall x\, \neg R(x)\ \vee \  \neg R(y)$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule5}{use abbreviation} \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{impl}{impl} in \hyperref[theo1:2]{$2$} at occurence $1$
} \\
\label{theo1:4}
  $4$ & $(P\ \vee \  Q)\ \rightarrow \  (Q\ \vee \  P)$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule2}{add axiom} \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{axiom3}{axiom3} } \\
\label{theo1:5}
  $5$ & $(\neg \forall x\, \neg R(x)\ \vee \  Q)\ \rightarrow \  (Q\ \vee \  \neg \forall x\, \neg R(x))$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule4}{replace}  $P$ by $\neg \forall x\, \neg R(x)$ in \hyperref[theo1:4]{$4$}
} \\
\label{theo1:6}
  $6$ & $(\neg \forall x\, \neg R(x)\ \vee \  \neg R(y))\ \rightarrow \  (\neg R(y)\ \vee \  \neg \forall x\, \neg R(x))$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule4}{replace}  $Q$ by $\neg R(y)$ in \hyperref[theo1:5]{$5$}
} \\
\label{theo1:7}
  $7$ & $\neg R(y)\ \vee \  \neg \forall x\, \neg R(x)$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule1}{MP} with \hyperref[theo1:3]{$3$}, \hyperref[theo1:6]{$6$}} \\
\label{theo1:8}
  $8$ & $R(y)\ \rightarrow \  \neg \forall x\, \neg R(x)$
  & {\tiny \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{rule6}{reverse abbreviation} \hyperref{propaxiom_1.00.00_1.00.00.pdf}{}{impl}{impl} in \hyperref[theo1:7]{$7$} at occurence $1$
} \\
\label{theo1:9}
  $9$ & $\exists y\, R(y)\ \rightarrow \  \neg \forall x\, \neg R(x)$
  & {\tiny \hyperref{predaxiom_1.00.00_1.00.00.pdf}{}{predrule4}{Particularize} by $y$ in \hyperref[theo1:8]{$8$}} \\
\label{theo1:10}
  $10$ & $\exists x\, R(x)\ \rightarrow \  \neg \forall x\, \neg R(x)$
  & {\tiny \hyperref{predaxiom_1.00.00_1.00.00.pdf}{}{predrule1}{rename}  $y$ into $x$ in \hyperref[theo1:9]{$9$} at occurence $1$
} \\
 & & \qedhere
\end{longtable}
\end{proof}


\end{document}
