A scrap-book of elementary mathematics; notes, recreations, essays (1908)
White, William Frank, 1871- · Chicago, The Open Court Pub. Co · leaf 182
ean school, and Fig. 38, a "magic hexa- gram commonly called the shield of David and fre- quently used on synagogues" (Carus), have no points of odd order; each is therefore unicursal. A figure with only two points of odd order can be traced by one stroke by starting at one of those points. E. g.,… … Fig. 39- One may make a game of it by drawing a figure, as Lucas suggests, like Fig. 39, but in larger scale on cardboard, placing a small counter on the middle of each line that joins two neighboring points, and setting the problem to determine the course to follow in re- moving all the counters…
Mathematical recreations
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
