Collimatrix Posted February 14, 2018 Report Share Posted February 14, 2018 On the bizarre and dodgy etymology of the word "sine": Quote Link to comment Share on other sites More sharing options...
Oedipus Wreckx-n-Effect Posted February 25, 2018 Report Share Posted February 25, 2018 Quote Link to comment Share on other sites More sharing options...
Mogensthegreat Posted June 23, 2018 Report Share Posted June 23, 2018 My mother is a math professor, and showed me this proof after seeing it at a conference: ...99999999.0 represents an infinitely large number composed of 9's and stopping at the decimal place) ...99999999.0 = x ...99999990.0 = 10x (as the 9's will stretch to infinity all the same, even when multiplied by 10) 9 = -9x -1 = x ...99999999.0 = -1 Secondary way of looking at it: ...9999999999.0 = x (add 1) ...0000000000.0 = x+1 (as the carried-over one from adding one to 9 will never drop down into the number) ...9999999999.0+1 = 0 ...9999999999.0 = -1 Quote Link to comment Share on other sites More sharing options...
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