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  2. Index-matching material - Wikipedia

    en.wikipedia.org/wiki/Index-matching_material

    The index of the oil is typically chosen to match the index of the microscope lens glass, and of the cover slip. For more details, see the main article, oil immersion . Some microscopes also use other index-matching materials besides oil; see water immersion objective and solid immersion lens .

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  4. Database index - Wikipedia

    en.wikipedia.org/wiki/Database_index

    A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time said table is accessed.

  5. Dispersion staining - Wikipedia

    en.wikipedia.org/wiki/Dispersion_staining

    The color of these two bands of light will vary depending on where the particle and liquid match in refractive index, the location of λo. If the match is near the blue end of the spectrum then the Becke' Line moving into the particle will contain nearly all of the visible wavelengths except blue and will appear as a pale yellow.

  6. Search engine indexing - Wikipedia

    en.wikipedia.org/wiki/Search_engine_indexing

    The forward index is sorted to transform it to an inverted index. The forward index is essentially a list of pairs consisting of a document and a word, collated by the document. Converting the forward index to an inverted index is only a matter of sorting the pairs by the words. In this regard, the inverted index is a word-sorted forward index.

  7. Knuth–Morris–Pratt algorithm - Wikipedia

    en.wikipedia.org/wiki/Knuth–Morris–Pratt...

    A string-matching algorithm wants to find the starting index m in string S[] that matches the search word W[].. The most straightforward algorithm, known as the "brute-force" or "naive" algorithm, is to look for a word match at each index m, i.e. the position in the string being searched that corresponds to the character S[m].

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  9. LZ77 and LZ78 - Wikipedia

    en.wikipedia.org/wiki/LZ77_and_LZ78

    The algorithm is to initialize last matching index = 0 and next available index = 1 and then, for each token of the input stream, the dictionary searched for a match: {last matching index, token}. If a match is found, then last matching index is set to the index of the matching entry, nothing is output, and last matching index is left ...