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  2. APL syntax and symbols - Wikipedia

    en.wikipedia.org/wiki/APL_syntax_and_symbols

    Combinations A!B: Number of combinations of B taken A at a time U+0021 ! EXCLAMATION MARK: Diaeresis, Dieresis, Double-Dot A¨B: Over each, or perform each separately; B = on these; A = operation to perform or using (e.g., iota) U+00A8 ¨ DIAERESIS: Less than A<B: Comparison: 1 if true, 0 if false U+003C < LESS-THAN SIGN: Less than or equal A≤B

  3. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    Digit Three: 0020 U+0034 4 52 064 Digit Four: 0021 U+0035 5 53 065 Digit Five: 0022 U+0036 6 54 066 Digit Six: 0023 U+0037 7 55 067 Digit Seven: 0024 U+0038 8 56 070 Digit Eight: 0025 U+0039 9 57 071 Digit Nine: 0026 ASCII Punctuation & Symbols: U+003A : 58 072 Colon: 0027 U+003B ; 59 073 Semicolon: 0028 U+003C < 60 074 Less-than sign: 0029 U+ ...

  4. Syntax (programming languages) - Wikipedia

    en.wikipedia.org/wiki/Syntax_(programming_languages)

    Terminal symbols are the concrete characters or strings of characters (for example keywords such as define, if, let, or void) from which syntactically valid programs are constructed. Syntax can be divided into context-free syntax and context-sensitive syntax. [7] Context-free syntax are rules directed by the metalanguage of the programming ...

  5. Wikipedia:List of all single-letter-single-digit combinations

    en.wikipedia.org/wiki/Wikipedia:List_of_all...

    The list of all single-letter-single-digit combinations contains 520 elements of the form [[{{letter}}{{digit}}]] and [[{{letter}}-{{digit}}]]. In general, any abbreviation expansion page is located at the shorter link. Once the abbreviation page has been created, the hyphen link should {{R from abbreviation}} to the other page.

  6. de Bruijn sequence - Wikipedia

    en.wikipedia.org/wiki/De_Bruijn_sequence

    For example, a digital door lock with a 4-digit code (each digit having 10 possibilities, from 0 to 9) would have B (10, 4) solutions, with length 10 000. Therefore, only at most 10 000 + 3 = 10 003 (as the solutions are cyclic) presses are needed to open the lock, whereas trying all codes separately would require 4 × 10 000 = 40 000 presses.

  7. Python syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/Python_syntax_and_semantics

    Python supports normal floating point numbers, which are created when a dot is used in a literal (e.g. 1.1), when an integer and a floating point number are used in an expression, or as a result of some mathematical operations ("true division" via the / operator, or exponentiation with a negative exponent).

  8. Wikipedia:List of all single-digit-single-letter combinations

    en.wikipedia.org/wiki/Wikipedia:List_of_all...

    The list of all single-digit-single-letter combinations contains 1040 different combinations of the form [[{{digit}}{{letter}}]] and [[{{digit}}-{{letter}}]]. In general, any abbreviation expansion page is located at the shorter link. Once the abbreviation page has been created, the hyphen link should {{R from abbreviation}} to the other page.

  9. Kaprekar's routine - Wikipedia

    en.wikipedia.org/wiki/Kaprekar's_routine

    Although 11-digit and 13-digit numbers have only one solution, it forms a loop of five numbers and a loop of two numbers, respectively. [13] Hence, Prichett's result that the Kaprekar's constants are limited to 495 (3 digits) and 6174 (4 digits) [ 14 ] is verified.