Usually in scientific journals we deal with not

[lopebix427]

:: – irreversible intersection. Shows that two classes not only logically intersect, but that the first is of primary importance.

Example. Literary creativity is designated by 808.1, Russian literature – 882. If we want to show that the main topic of the work is literary creativity, and Russian literature is used as an example, then we set the UDC to 808.1::882.

' – index synthesis. Means that a special determinant is used.

Example: The classical period of language development is coded as 81`02.

Additionally, square brackets are used, which mean the logical unification of elements into one block. Their meaning is approximately the same as that of square brackets in mathematics: with them, the subsequent operation will be carried out not with the last element, but with the entire group.

Example of decryption
very long UDC indexes. But for clarity, let's try to decipher a more complex example - a composite one with determinants.

781.7(519.5)(02.068)=131.1

Let's break this code down into its elements:

781.7 – Theory and forms of national music of individual india telemarketing list peoples and countries;
(519.5) – South Korea (5 – Asia, 51 – Central and East Asian countries, 519 – Korea);
(02.068) – Rare books (02 – Books in general);
=131.1 – Italian language (1 – Indo-European languages, 13 – Romance languages, 131 – Italo-Romance languages).
We receive "A rare book on the theory of the forms of national music of South Korea in Italian".

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