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  2. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    The two formulas were described by the Irish monk Dicuil in about 816 in his Computus. [5] An English translation of Dicuil's account is available. [6] Occasionally it is necessary to compute large triangular numbers where the standard formula t = n*(n+1)/2 would suffer integer overflow before the final division by 2.

  3. Floor and ceiling functions - Wikipedia

    en.wikipedia.org/wiki/Floor_and_ceiling_functions

    The fractional part function has Fourier series expansion [19] {} = = ⁡ for x not an integer. At points of discontinuity, a Fourier series converges to a value that is the average of its limits on the left and the right, unlike the floor, ceiling and fractional part functions: for y fixed and x a multiple of y the Fourier series given ...

  4. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Legendre symbol: If p is an odd prime number and a is an integer, the value of () is 1 if a is a quadratic residue modulo p; it is –1 if a is a quadratic non-residue modulo p; it is 0 if p divides a.

  5. List of mathematical series - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_series

    An infinite series of any rational function of can be reduced to a finite series of polygamma functions, by use of partial fraction decomposition, [8] as explained here. This fact can also be applied to finite series of rational functions, allowing the result to be computed in constant time even when the series contains a large number of terms.

  6. Pentagonal number theorem - Wikipedia

    en.wikipedia.org/wiki/Pentagonal_number_theorem

    In summary, it has been shown that partitions into an even number of distinct parts and an odd number of distinct parts exactly cancel each other, producing null terms 0x n, except if n is a generalized pentagonal number = = /, in which case there is exactly one Ferrers diagram left over, producing a term (−1) k x n. But this is precisely ...

  7. How to keep babies warm in cold weather and other winter tips

    www.aol.com/keep-babies-warm-during-cold...

    Much of the UK is being hit with cold weather. Here are some tips for coping with low temperatures. LIVE: New weather warnings issued as snow and ice disrupt UK travel

  8. Will 2025 be a better year to buy a house? - AOL

    www.aol.com/2025-better-buy-house-201345421.html

    Redfin, a Seattle, Washington-based real estate giant, forecasts average 30-year fixed mortgage rates will remain in the high 6% range over the duration of 2025. Online real estate marketplace ...

  9. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS.It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA).

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