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  2. Null (SQL) - Wikipedia

    en.wikipedia.org/wiki/Null_(SQL)

    These mistakes are usually the result of confusion between Null and either 0 (zero) or an empty string (a string value with a length of zero, represented in SQL as ''). Null is defined by the SQL standard as different from both an empty string and the numerical value 0, however. While Null indicates the absence of any value, the empty string ...

  3. NaN - Wikipedia

    en.wikipedia.org/wiki/NaN

    In computing, NaN (/ n æ n /), standing for Not a Number, is a particular value of a numeric data type (often a floating-point number) which is undefined as a number, such as the result of 0/0. Systematic use of NaNs was introduced by the IEEE 754 floating-point standard in 1985, along with the representation of other non-finite quantities ...

  4. Null hypothesis - Wikipedia

    en.wikipedia.org/wiki/Null_hypothesis

    For example, the angular momentum of the universe is zero. If not true, the theory of the early universe may need revision. Null hypotheses of homogeneity are used to verify that multiple experiments are producing consistent results. For example, the effect of a medication on the elderly is consistent with that of the general adult population.

  5. Names for the number 0 - Wikipedia

    en.wikipedia.org/wiki/Names_for_the_number_0

    The character 零 (pinyin: líng) means "zero" in Chinese, although 〇 is also common. Etymologically 零 is an onomatopoeic word for "light rain". The upper part of the character is 雨, meaning "rain", and the lower part is 令 (lìng), for the sound. [1] Czech: nula Dutch: nul /nyl/ English: zero: There are many other names: French: zéro ...

  6. Lexicographic order - Wikipedia

    en.wikipedia.org/wiki/Lexicographic_order

    In mathematics, the lexicographic or lexicographical order (also known as lexical order, or dictionary order) is a generalization of the alphabetical order of the dictionaries to sequences of ordered symbols or, more generally, of elements of a totally ordered set. There are several variants and generalizations of the lexicographical ordering.

  7. Basic reproduction number - Wikipedia

    en.wikipedia.org/wiki/Basic_reproduction_number

    is the average number of people infected from one other person. For example, Ebola has an of two, so on average, a person who has Ebola will pass it on to two other people.. In epidemiology, the basic reproduction number, or basic reproductive number (sometimes called basic reproduction ratio or basic reproductive rate), denoted (pronounced R nought or R zero), [1] of an infection is the ...

  8. New Oxford American Dictionary - Wikipedia

    en.wikipedia.org/wiki/New_Oxford_American_Dictionary

    The New Oxford American Dictionary (NOAD) is a single-volume dictionary of American English compiled by American editors at the Oxford University Press. NOAD is based upon the New Oxford Dictionary of English ( NODE ), published in the United Kingdom in 1998, although with substantial editing, additional entries, and the inclusion of illustrations.

  9. Tofu - Wikipedia

    en.wikipedia.org/wiki/Tofu

    For example, Japanese ganmodoki is a mixture of chopped vegetables and mashed tofu. The mixture is bound together with starch and deep-fried. The mixture is bound together with starch and deep-fried. Chinese families sometimes make a steamed meatloaf or meatball dish from equal parts of coarsely mashed tofu and ground pork.