{'fraction_non_alphanumeric': 0.01171875, 'fraction_numerical': 0.0, 'mean_word_length': 5.123505976095617, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Query Expansion Method Application for Searching in Mathematical Subject Domains

The article focuses on the problem of information retrieval in the mathematical scientific articles. Issues related to scientific publication “in the scientific information environment” are considered. The possibilities of expanding the search query in the presence of a subject domain thesaurus are discussed. The formulation of an information request in specific subject domains is not always possible for an insufficiently competent user. The query expansion process is of particular importance for subject domains, where the search is based on special terminology. Automatic query expansion can serve as a necessary tool with which the user can get a pertinent search result. Mathematical texts are differed by the presence of a specific structure and the use of formulas. Formulas can often reflect the main results of research and therefore it is important to be able to use them in an advanced query. Modern programming tools allow you to search by formulas and use them for indexing. It is proposed to include formulas in mathematical thesauruses and in this way to create a context of formulas for their effective inclusion in search queries. The role of the context defined by the relations of thesaurus concepts is both to refine the query and to increase the scale of the sample on request. Examples are implemented for subject areas of ordinary differential equations, equations of mixed type, special functions of mathematical physics, etc.