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wu :: forums    riddles    medium (Moderators: towr, Eigenray, Grimbal, ThudnBlunder, william wu, SMQ, Icarus)    stick numbers equality « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: stick numbers equality  (Read 2179 times) riddler358 Junior Member     Posts: 84 stick numbers equality   lm3.png « on: May 28th, 2016, 6:24am » Quote Modify with a least number of stick moves make proper equality IP Logged pex Uberpuzzler     Gender: Posts: 880 Re: stick numbers equality   9minus5.png « Reply #1 on: May 28th, 2016, 6:28pm » Quote Modify Two moves is possible... Can it be done in one? IP Logged riddler358 Junior Member     Posts: 84 Re: stick numbers equality   « Reply #2 on: May 29th, 2016, 2:45am » Quote Modify very neat solution and very good question - yes, it's possible in 1 IP Logged rmsgrey Uberpuzzler     Gender: Posts: 2873 Re: stick numbers equality   « Reply #3 on: May 29th, 2016, 4:57am » Quote Modify 5 = 5 = 5 IP Logged dudiobugtron Uberpuzzler     Posts: 735 Re: stick numbers equality   « Reply #4 on: May 31st, 2016, 6:20pm » Quote Modify It's already a proper equality; no need to move anything. PS: g = 10   --------------- PPS: Another 1-stick solution is: 0 - 5 = 5.  You do need to invert your head though. « Last Edit: May 31st, 2016, 6:21pm by dudiobugtron » IP Logged Hippo Uberpuzzler     Gender: Posts: 919 Re: stick numbers equality   « Reply #5 on: Jul 15th, 2016, 2:09pm » Quote Modify on May 29th, 2016, 4:57am, rmsgrey wrote: 5 = 5 = 5   That would require two moves ... or the equal signs would not be aligned.   I suppose 0-5=5 is intended solution. You just must walk around the table. IP Logged rmsgrey Uberpuzzler     Gender: Posts: 2873 Re: stick numbers equality   « Reply #6 on: Jul 16th, 2016, 7:42am » Quote Modify on Jul 15th, 2016, 2:09pm, Hippo wrote:   That would require two moves ... or the equal signs would not be aligned.   Look carefully at the original image. The minus sign is level with the upper stick of the equals sign. IP Logged rloginunix Uberpuzzler     Posts: 1029 Re: stick numbers equality   « Reply #7 on: Jul 16th, 2016, 11:26am » Quote Modify If arbitrary geometric transformations are allowed, should not this be another 1-move solution: 9 into 0, rotate (reflect) about a vertical axis or look "behind" for 2=2-0? IP Logged Grimbal wu::riddles Moderator Uberpuzzler     Gender: Posts: 7527 Re: stick numbers equality   « Reply #8 on: Jul 19th, 2016, 5:21am » Quote Modify on Jul 15th, 2016, 2:09pm, Hippo wrote: That would require two moves ... or the equal signs would not be aligned. Would it?  If you look carefully at the original picture, the '-' is already slightly above the center.  By chance? « Last Edit: Jul 19th, 2016, 5:22am by Grimbal » IP Logged rloginunix Uberpuzzler     Posts: 1029 Re: stick numbers equality   9m5.png « Reply #9 on: Jul 19th, 2016, 6:56am » Quote Modify Zooming in on the region in question with software here is what we see.   Form muster: is it OK that while the problem statements says 'equality' (singular) 5=5=5 has 'equalities', plural? IP Logged rmsgrey Uberpuzzler     Gender: Posts: 2873 Re: stick numbers equality   « Reply #10 on: Jul 19th, 2016, 7:15am » Quote Modify on Jul 19th, 2016, 6:56am, rloginunix wrote: Zooming in on the region in question with software here is what we see.   Form muster: is it OK that while the problem statements says 'equality' (singular) 5=5=5 has 'equalities', plural?   The problem statement says "make proper equality" not "make a proper equality" so equality could be a general property of the desired expression rather than referring explicitly to a single instance of equality. IP Logged Pages: 1  Reply Notify of replies Send Topic Print 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 « Previous topic | Next topic »

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