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  2. Lookup table - Wikipedia

    en.wikipedia.org/wiki/Lookup_table

    This has been followed by subsequent spreadsheets, such as Microsoft Excel, and complemented by specialized VLOOKUP and HLOOKUP functions to simplify lookup in a vertical or horizontal table. In Microsoft Excel the XLOOKUP function has been rolled out starting 28 August 2019.

  3. LibreOffice - Wikipedia

    en.wikipedia.org/wiki/LibreOffice

    LibreOffice (/ ˈ l iː b r ə /) [11] is a free and open-source office productivity software suite, a project of The Document Foundation (TDF). It was forked in 2010 from OpenOffice.org, an open-sourced version of the earlier StarOffice.

  4. Filter (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Filter_(mathematics)

    A subset F of a partially ordered set (P, ≤) is a filter or dual ideal if the following are satisfied: [3] Nontriviality The set F is non-empty. Downward directed For every x, y ∈ F, there is some z ∈ F such that z ≤ x and z ≤ y.