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wu :: forums    riddles    medium (Moderators: Eigenray, Icarus, Grimbal, towr, ThudnBlunder, SMQ, william wu) Pages: 1 ... 19 20 21 22 23  ...  61 Start new topic    Subject Started by Replies Views Last post Moved: the sum of sub series is zero southsouth 0 283 Dec 27th, 2007, 6:15am by southsouth checkerboard videogamer1805 2 521 Dec 22nd, 2007, 5:17pm by FiBsTeR Proof (?) of Fermat's Last Theorem cool_joh 5 675 Dec 20th, 2007, 5:11pm by FiBsTeR Rotating Circle of Cards william wu 7 666 Dec 17th, 2007, 3:38pm by Joe Fendel Irrationality of e william wu 5 612 Dec 17th, 2007, 12:52pm by Hippo Visual Co-ordinate Puzzle Sonoffath 3 545 Dec 17th, 2007, 3:11am by towr Geometry: Find angle in 50-60-70 triangle Aryabhatta 14 4837 Dec 17th, 2007, 1:23am by JiNbOtAk NAV CNT VEH GDE Grimbal 16 2437 Dec 12th, 2007, 5:17am by Random Lack of Squiggily Lines Neat problem from the Maryland Math Olympiad amichail 15 1893 Dec 11th, 2007, 6:55am by rmsgrey the Who Does This Look Like logic game krzydj13121an 6 613 Dec 10th, 2007, 11:47pm by mikedagr8 Hardy Perennial Barukh 12 984 Dec 8th, 2007, 10:17am by ThudnBlunder Minimizing sum of distances while numbering a net Hippo 4 587 Nov 26th, 2007, 12:38am by Hippo simplify tony123 3 2461 Nov 24th, 2007, 7:04pm by Johan_Gunardi A characterization of regular n-gons ecoist 10 2940 Nov 23rd, 2007, 4:27pm by Obob 1, 2, 6, 42, ... cool_joh 4 2020 Nov 23rd, 2007, 9:08am by Barukh rational numbers Ghost Sniper 8 2389 Nov 22nd, 2007, 12:50am by Barukh ABCD is a cyclic quadrilateral tony123 4 3178 Nov 20th, 2007, 8:26am by pex Solvng in Radicals Barukh 1 590 Nov 19th, 2007, 11:46am by Joe Fendel solve  sqrt(x+1999·sqrt(x+1999·sqrt(...))) = x tony123 6 612 Nov 18th, 2007, 9:10am by towr Polynomials semi-good prime generators?  Not! ecoist 10 639 Nov 17th, 2007, 3:22pm by Aryabhatta Determine all positive integers tony123 1 327 Nov 17th, 2007, 3:17pm by Aryabhatta collinear points tony123 0 278 Nov 17th, 2007, 1:43am by tony123 Regular polyhedrons Ghost Sniper 4 532 Nov 13th, 2007, 12:43am by Grimbal X and Y are interior points tony123 6 847 Nov 10th, 2007, 4:58am by Barukh Cake Division GWabel 13 994 Nov 8th, 2007, 9:14am by Aryabhatta Decanting Problem checker 14 2460 Nov 8th, 2007, 7:00am by rmsgrey product of the roots tony123 3 443 Nov 8th, 2007, 1:28am by Grimbal Moved: Let a, b, c be three consecutive tony123 0 369 Nov 5th, 2007, 3:18am by towr Non-negative Polynomial Decomposition william wu 7 847 Nov 3rd, 2007, 12:07pm by william wu Largest Ellipse Inside Pythagorean Triangle? ThudnBlunder 2 1515 Nov 1st, 2007, 5:45pm by ecoist Pages: 1 ... 19 20 21 22 23  ...  61 Start new topic  Normal Topic Hot Topic (More than 15 Replies) Very Hot Topic (More than 25 Replies) Locked Topic Sticky Topic Sticky Locked Topic Forum Jump: ----------------------------- riddles -----------------------------  - easy => medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese

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