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26 <span class="paper_author">
27 Andrea Asperti, Enrico Tassi
29 <span class="paper_title">
30 Higher order proof reconstruction from paramodulation-based refutations:
31 the unit equality case
33 <a class="paper_download" href="PAPERS/hopr.pdf">
34 <span class="pdf_logo">.pdf</span>
36 <span class="paper_info">
37 Accepted for publication in the proceedings of MKM 2007: The 6th
38 International Conference on Mathematical Knowledge Management.
40 <span class="paper_abstract">
41 In this paper we address the problem of reconstructing a
42 higher order, checkable proof object starting from a proof trace left by a
43 first order automatic proof searching procedure, in a restricted equational
44 framework. The automatic procedure is based on superposition rules for
45 the unit equality case. Proof transformation techniques aimed to improve
46 the readability of the final proof are discussed.
51 <span class="paper_author">
52 Claudio Sacerdoti Coen, Stefano Zacchiroli
54 <span class="paper_title">
55 Spurious Disambiguation Error Detection
57 <a class="paper_download" href="PAPERS/disambiguation-errors.pdf">
58 <span class="pdf_logo">.pdf</span>
60 <span class="paper_info">
61 Accepted for publication in the proceedings of MKM 2007: The 6th
62 International Conference on Mathematical Knowledge Management.
64 <span class="paper_abstract">
65 The disambiguation approach to the input of formulae enables the user to
66 type correct formulae in a terse syntax close to the usual ambiguous
67 mathematical notation. When it comes to incorrect formulae we want to
68 present only errors related to the interpretation meant by the user, hiding
69 errors related to other interpretations (spurious errors). We propose a
70 heuristic to recognize spurious errors, which has been integrated with our
71 former efficient disambiguation algorithm.
76 <span class="paper_author">
77 Andrea Asperti, Claudio Sacerdoti Coen, Enrico Tassi, Stefano Zacchiroli
79 <span class="paper_title">
80 Crafting a Proof Assistant
82 <a class="paper_download" href="PAPERS/matita_types.pdf">
83 <span class="pdf_logo">.pdf</span>
85 <span class="paper_info">
86 Accepted for publication in the Proceedings of Types 2006: Conference of
87 the Types Project. Nottingham, UK -- April 18-21, 2006.
89 <span class="paper_abstract">
90 Proof assistants are complex applications whose develop-
91 ment has never been properly systematized or documented. This work is
92 a contribution in this direction, based on our experience with the devel-
93 opment of Matita: a new interactive theorem prover based—as Coq—on
94 the Calculus of Inductive Constructions (CIC). In particular, we analyze
95 its architecture focusing on the dependencies of its components, how they
96 implement the main functionalities, and their degree of reusability.
97 The work is a first attempt to provide a ground for a more direct com-
98 parison between different systems and to highlight the common func-
99 tionalities, not only in view of reusability but also to encourage a more
100 systematic comparison of different softwares and architectural solutions.
106 <span class="paper_author">
107 Andrea Asperti, Claudio Sacerdoti Coen, Enrico Tassi, Stefano Zacchiroli
109 <span class="paper_title">
110 User Interaction with the Matita Proof Assistant
112 <a class="paper_download" href="PAPERS/matita.pdf">
113 <span class="pdf_logo">.pdf</span>
115 <span class="paper_info">
116 Accepted for publication in Journal of Automated Reasoning, Special Issue
117 on User Interfaces for Theorem Proving.
119 <span class="paper_abstract">
120 Matita is a new, document-centric, tactic-based interactive theorem
121 prover. This paper focuses on some of the distinctive features of the user interaction
122 with Matita, mostly characterized by the organization of the library as a search-
123 able knowledge base, the emphasis on a high-quality notational rendering, and the
124 complex interplay between syntax, presentation, and semantics.
130 <span class="paper_author">
131 Claudio Sacerdoti Coen, Enrico Tassi, Stefano Zacchiroli
133 <span class="paper_title">
134 Tinycals: step by step tacticals
136 <a class="paper_download" href="PAPERS/tinycals.pdf">
137 <span class="pdf_logo">.pdf</span>
139 <span class="paper_info">
140 In Proceedings of UITP 2006: User Interfaces for Theorem Provers. Seattle,
141 WA -- August 21, 2006. ENTCS, Volume 174, Issue 2 (May 2007), Pages 125 -
144 <span class="paper_abstract">
145 Most of the state-of-the-art proof assistants are based on procedural
146 proof languages, scripts, and rely on LCF tacticals as the primary tool
147 for tactics composition. In this paper we discuss how these ingredients
148 do not interact well with user interfaces based on the same interaction
149 paradigm of Proof General (the de facto standard in this field),
150 identifying in the coarse-grainedness of tactical evaluation the key
153 We propose tinycals as an alternative to a subset of LCF tacticals,
154 showing that the user does not experience the same problem if tacticals
155 are evaluated in a more fine-grained manner. We present the formal
156 operational semantics of tinycals as well as their implementation in the
157 Matita proof assistant.
163 <span class="paper_author">Luca Padovani, Stefano Zacchiroli</span><br/>
164 <span class="paper_title">
165 From notation to semantics: there and back again
167 <a class="paper_download" href="PAPERS/notation.pdf">
168 <span class="pdf_logo">.pdf</span>
170 <span class="paper_info">
171 Accepted for publication in the proceedings of MKM 2006: The 5th
172 International Conference on Mathematical Knowledge Management.
173 Wokingham, UK -- August 11-12, 2006.
175 <span class="paper_abstract">
176 Mathematical notation is a structured, open, and ambiguous language. In
177 order to support mathematical notation in MKM applications one must
178 necessarily take into account presentational as well as semantic aspects.
179 The former are required to create a familiar, comfortable, and usable
180 interface to interact with. The latter are necessary in order to process
181 the information meaningfully. In this paper we investigate a framework
182 for dealing with mathematical notation in a meaningful, extensible way,
183 and we show an effective instantiation of its architecture to the field
184 of interactive theorem proving. The framework builds upon well-known
185 concepts and widely-used technologies and it can be easily adopted by
186 other MKM applications.
192 <span class="paper_author">
193 Andrea Asperti, Ferruccio Guidi, Claudio Sacerdoti Coen, Enrico Tassi, Stefano Zacchiroli
195 <span class="paper_title">
196 A content based mathematical search engine: Whelp
198 <a class="paper_download" href="PAPERS/whelp.pdf">
199 <span class="pdf_logo">.pdf</span>
201 <span class="paper_info">
202 In Proceedings of TYPES 2004 conference Types for Proofs and Programs.
203 Paris, France -- December 15-18, 2004. LNCS 3839/2004, Springer-Verlag
204 Heidelberg, ISBN 3-540-31428-8, pp. 17-32
206 <span class="paper_abstract">
207 The prototype of a content based search engine for mathematical knowledge
208 supporting a small set of queries requiring matching and/or typing
209 operations is described. The prototype, called Whelp, exploits a metadata
210 approach for indexing the information that looks far more flexible than
211 traditional indexing techniques for structured expressions like
212 substitution, discrimination, or context trees. The prototype has been
213 instantiated to the standard library of the Coq proof assistant extended
214 with many user contributions.
220 <span class="paper_author">
221 Claudio Sacerdoti Coen, Stefano Zacchiroli
223 <span class="paper_title">
224 Efficient Ambiguous Parsing of Mathematical Formulae
226 <a class="paper_download" href="PAPERS/disambiguation.pdf">
227 <span class="pdf_logo">.pdf</span>
229 <span class="paper_info">
230 In Proceedings of MKM 2004
231 Third International Conference on Mathematical Knowledge Management.
232 September 19th - 21st, 2004 Bialowieza - Poland. LNCS 3119/2004,
233 Springer-Verlag Heidelberg, ISBN 3-540-23029-7, pp. 347-362
235 <span class="paper_abstract">
236 Mathematical notation has the characteristic of being ambiguous:
237 operators can be overloaded and information that can be deduced is often
238 omitted. Mathematicians are used to this ambiguity and can easily
239 disambiguate a formula making use of the context and of their ability to
240 find the right interpretation.
242 Software applications that have to deal with formulae usually avoid these
243 issues by fixing an unambiguous input notation. This solution is annoying
244 for mathematicians because of the resulting tricky syntaxes and becomes a
245 show stopper to the simultaneous adoption of tools characterized by
246 different input languages.
248 In this paper we present an efficient algorithm suitable for ambiguous
249 parsing of mathematical formulae. The only requirement of the algorithm
250 is the existence of a validity predicate over abstract syntax trees of
251 incomplete formulae with placeholders. This requirement can be easily
252 fulfilled in the applicative area of interactive proof assistants, and in
253 several other areas of Mathematical Knowledge Management.