A scrap-book of elementary mathematics; notes, recreations, essays (1908)
White, William Frank, 1871- · Chicago, The Open Court Pub. Co · leaf 102
REPRESENTATION OF COMPLEX NUMBERS. 93 it once as a factor revolving the line through one of the two right angles. Then OU pictures the number +V-1. Similarly, since multiplication of -1 by - V-1 twice produces +1, - V-1 may be considered as the factor which revolves from OL through one right angle… … O Fig. 4- a line b units long and extending up, and - V-T'ft a line .& units long extending down. The geometric interpretation of the imaginary was made by H. Kiihn in 1750, in the Transactions of the St. Petersburg Academy. To represent graphically the number o+6 -1 (see Fig. 4), we lay off OA in…
Mathematical recreations
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
