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## Polibits

*versión On-line* ISSN 1870-9044

### Polibits no.43 México ene./jun. 2011

**Contextual Analysis of Mathematical Expressions for Advanced Mathematical Search**

**Keisuke Yokoi ^{1}, Minh–Quoc Nghiem^{2}, Yuichiroh Matsubayashi^{3}, and Akiko Aizawa^{4}**

^{1}* Department of Computer Science, University of Tokyo, Hongo 7–3–1, Bunkyo–ku, Tokyo, Japan (e–mail: *kei–yoko@nii.ac.jp).

^{2 }*Department of Informatics, The Graduate University for Advanced Studies, Tokyo, Japan (e–mail:* nqminh@nii.ac.jp).

^{3}* National Institute of Informatics, Tokyo, Japan (e–mail: *y–matsu@nii.ac.jp).

^{4 }*Department of Computer Science, University of Tokyo, Hongo 7–3–1, Bunkyo–ku, Tokyo, Japan and with National Institute of Informatics, Tokyo, Japan (e–mail: *aizawa@nii.ac.jp).

Manuscript received November 12, 2010.

Manuscript accepted for publication January 10, 2011.

**Abstract**

We found a way to use mathematical search to provide better navigation for reading papers on computers. Since the superficial information of mathematical expressions is ambiguous, considering not only mathematical expressions but also the texts around them is necessary. We present how to extract a natural language description, such as variable names or function definitions that refer to mathematical expressions with various experimental results. We first define an extraction task and constructed a reference dataset of 100 Japanese scientific papers by hand. We then propose the use of two methods, pattern matching and machine learning based ones for the extraction task. The effectiveness of the proposed methods is shown through experiments by using the reference set.

**Key words**: Natural language processing, mathematical expressions, pattern matching, machine learning.

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