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These numbers, borrowing crossword terminology, are commonly called "clues". The objective of the puzzle is to insert a digit from 1 to 9 inclusive into each white cell so that the sum of the numbers in each entry matches the clue associated with it and that no digit is duplicated in any entry.
Number systems have progressed from the use of fingers and tally marks, perhaps more than 40,000 years ago, to the use of sets of glyphs able to represent any conceivable number efficiently. The earliest known unambiguous notations for numbers emerged in Mesopotamia about 5000 or 6000 years ago.
A cross-figure or crossnumber is the numerical analogy of a crossword, in which the solutions to the clues are numbers instead of words. Clues are usually arithmetical expressions, but can also be general knowledge clues to which the answer is a number or year. There are also numerical fill-in crosswords.
Clues and answers must always match in part of speech, tense, aspect, number, and degree. A plural clue always indicates a plural answer and a clue in the past tense always has an answer in the past tense. A clue containing a comparative or superlative always has an answer in the same degree (e.g., [Most difficult] for TOUGHEST). [6]
With Gödel numbers, a logic statement can be broken down into a number sequence. By taking the n prime numbers to the power of the Gödel numbers in the sequence, and then multiplying the terms together, a unique final product is generated. In this way, every logic statement can be encoded as its own number.
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In the Inca empire of South America, which did not have writing, records were kept via an elaborate form of knots in cords, quipu, whose meaning has been lost. In Western Europe in the Late Middle Ages public records included census records as well as records of birth, death, and marriage; an example is the 1086 Domesday Book of William the ...
A niche collector’s item, The Island Book of Records Volume I: 1959-1968 minutely details each Island release with input from individuals who worked on them firsthand. In between are “pink ...