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