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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    Starting in March, the sequence basically alternates 3, 2, 3, 2, 3, but every five months there are two 31-day months in a row (July–August and December–January). [1] The fraction 13/5 = 2.6 and the floor function have that effect; the denominator of 5 sets a period of 5 months.

  3. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The odd numbered months can be remembered with the mnemonic "I work from 9 to 5 at the 7-11", i.e., 9/5, 7/11, and also 5/9 and 11/7, are all doomsdays (this is true for both the Day/Month and Month/Day conventions). [7]

  4. Simplification - Wikipedia

    en.wikipedia.org/wiki/Simplification

    Simplification is the process of replacing a mathematical expression by an equivalent one that is simpler (usually shorter), according to a well-founded ordering. Examples include:

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  6. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For example: 24 x 11 = 264 because 2 + 4 = 6 and the 6 is placed in between the 2 and the 4. Second example: 87 x 11 = 957 because 8 + 7 = 15 so the 5 goes in between the 8 and the 7 and the 1 is carried to the 8.

  7. Summation by parts - Wikipedia

    en.wikipedia.org/wiki/Summation_by_parts

    [2] Summation by parts is frequently used to prove Abel's theorem and Dirichlet's test . One can also use this technique to prove Abel's test : If ∑ n b n {\textstyle \sum _{n}b_{n}} is a convergent series , and a n {\displaystyle a_{n}} a bounded monotone sequence , then S N = ∑ n = 0 N a n b n {\textstyle S_{N}=\sum _{n=0}^{N}a_{n}b_{n ...

  8. Enzo Yeh - Wikipedia

    en.wikipedia.org/wiki/Enzo_Yeh

    Yeh made his car racing debut in the Formula 4 South East Asia Championship for Asia Racing Team. [8] Despite missing the Zhuzhou round as he participated in the Ferrari Scouting World Final, [9] [10] he achieved one podium finish at Sepang, and completed the season as 7th overall and 3rd in the rookies.

  9. Integration by reduction formulae - Wikipedia

    en.wikipedia.org/wiki/Integration_by_reduction...

    The main idea is to express an integral involving an integer parameter (e.g. power) of a function, represented by I n, in terms of an integral that involves a lower value of the parameter (lower power) of that function, for example I n-1 or I n-2. This makes the reduction formula a type of recurrence relation. In other words, the reduction ...