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2. Timeline of mathematics - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_mathematics

   This is a timeline of pure and applied mathematics history.It is divided here into three stages, corresponding to stages in the development of mathematical notation: a "rhetorical" stage in which calculations are described purely by words, a "syncopated" stage in which quantities and common algebraic operations are beginning to be represented by symbolic abbreviations, and finally a "symbolic ...

3. Counting - Wikipedia

   en.wikipedia.org/wiki/Counting

   Number blocks, which can be used for counting. Counting is the process of determining the number of elements of a finite set of objects; that is, determining the size of a set. . The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the ...

4. Timeline of numerals and arithmetic - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_numerals_and...

   c. 3100 BC — Egypt, earliest known decimal system allows indefinite counting by way of introducing new symbols, . [ citation needed ] c. 2800 BC — Indus Valley civilization on the Indian subcontinent , earliest use of decimal ratios in a uniform system of ancient weights and measures , the smallest unit of measurement used is 1.704 ...

5. List of decades, centuries, and millennia - Wikipedia

   en.wikipedia.org/wiki/List_of_decades,_centuries...

   Timelines of world history; List of timelines; Chronology; See calendar and list of calendars for other groupings of years. See history, history by period, and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang, Geologic time scale, Timeline of evolution, and Logarithmic timeline.

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Penney's game - Wikipedia

   en.wikipedia.org/wiki/Penney's_game

   the second player must choose (not-2)-1-2 where (not-2) is the opposite of the second choice of the first player. An intuitive explanation for this result is that in any case that the sequence is not immediately the first player's choice, the chances for the first player getting their sequence-beginning, the opening two choices, are usually the ...