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\begin{abstract}
We present an embedding of the second-order fragment of the Theory of Abstract Objects as described in Edward Zalta's
upcoming work Principia Logico-Metaphysica (PLM\cite{PM}) in the automated reasoning framework Isabelle/HOL. The Theory of Abstract
Objects is a metaphysical theory that reifies property patterns, as they for example occur in the abstract reasoning
of mathematics, as \emph{abstract objects} and provides an axiomatic framework that allows to reason about these objects.
It thereby serves as a fundamental metaphysical theory that can be used to axiomatize and describe a wide range of philosophical
objects, such as Platonic forms or Leibniz' concepts, and has the ambition to function as a foundational theory of mathematics.
The target theory of our embedding as described in chapters 7-9 of PLM\cite{PM} employs a modal relational type theory as
logical foundation for which a representation in functional type theory is known to be challenging\cite{rtt}.
Nevertheless we arrive at a functioning representation of the theory in the functional logic of Isabelle/HOL based on a semantical
representation of an Aczel-model of the theory. Based on this representation we construct an implementation of the deductive
system of PLM (\cite[Chap. 9]{PM}) which allows to automatically and interactively find and verify theorems of PLM.
Our work thereby supports the concept of shallow semantical embeddings of
logical systems in HOL as a universal tool for logical reasoning as
promoted by Christoph Benzm\"uller\cite{UniversalReasoning}.
The most notable result of the presented work is the discovery of a previously
unknown paradox in the formulation of the Theory of Abstract Objects.
The embedding of the theory in Isabelle/HOL played a vital
part in this discovery. Furthermore it was possible to immediately offer
several options to modify the theory to guarantee its consistency.
Thereby our work could provide a significant contribution to the
development of a proper grounding for object theory. \end{abstract}
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Hiermit versichere ich, dass ich die vorliegende Arbeit selbstst\"andig
verfasst und keine anderen als die angegebenen Quellen und Hilfsmittel
benutzt habe.
Alle Ausf\"uhrungen, die w\"ortlich oder inhaltlich aus fremden Quellen \"ubernommen sind, habe ich als solche kenntlich gemacht.
Diese Arbeit wurde in gleicher oder \"ahnlicher Form noch bei keiner
anderen Universit\"at als Pr\"ufungsleistung eingereicht und ist auch
noch nicht ver\"offentlicht.
\vspace{50pt} \noindent\hfill\rule{7cm}{.4pt}\par \hfill Daniel Kirchner
\end{document}
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