Mathematics in Computer Science

, Volume 9, Issue 1, pp 5–22

HOL(y)Hammer: Online ATP Service for HOL Light

Open Access

DOI: 10.1007/s11786-014-0182-0

Cite this article as:
Kaliszyk, C. & Urban, J. Math.Comput.Sci. (2015) 9: 5. doi:10.1007/s11786-014-0182-0


HOL(y)Hammer is an online AI/ATP service for formal (computer-understandable) mathematics encoded in the HOL Light system. The service allows its users to upload and automatically process an arbitrary formal development (project) based on HOL Light, and to attack arbitrary conjectures that use the concepts defined in some of the uploaded projects. For that, the service uses several automated reasoning systems combined with several premise selection methods trained on all the project proofs. The projects that are readily available on the server for such query answering include the recent versions of the Flyspeck, Multivariate Analysis and Complex Analysis libraries. The service runs on a 48-CPU server, currently employing in parallel for each task 7 AI/ATP combinations and 4 decision procedures that contribute to its overall performance. The system is also available for local installation by interested users, who can customize it for their own proof development. An Emacs interface allowing parallel asynchronous queries to the service is also provided. The overall structure of the service is outlined, problems that arise and their solutions are discussed, and an initial account of using the system is given.

Mathematics Subject Classification

68T15 68T05 68T20 68T35 


Automated theorem proving Interactive theorem proving Machine learning Formal proof assistants Large-theory automated reasoning HOL light 

Copyright information

© The Author(s) 2014

Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

Authors and Affiliations

  1. 1.University of InnsbruckInnsbruckAustria
  2. 2.Radboud UniversityNijmegenThe Netherlands

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