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   Author  Topic: stick numbers equality  (Read 922 times)
riddler358
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stick numbers equality   lm3.png
« on: May 28th, 2016, 6:24am »
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with a least number of stick moves make proper equality
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pex
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Re: stick numbers equality   9minus5.png
« Reply #1 on: May 28th, 2016, 6:28pm »
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Two moves is possible... Can it be done in one?
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riddler358
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Re: stick numbers equality  
« Reply #2 on: May 29th, 2016, 2:45am »
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very neat solution and very good question - yes, it's possible in 1
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rmsgrey
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Re: stick numbers equality  
« Reply #3 on: May 29th, 2016, 4:57am »
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5 = 5 = 5
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dudiobugtron
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Re: stick numbers equality  
« Reply #4 on: May 31st, 2016, 6:20pm »
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It's already a proper equality; no need to move anything. PS: g = 10
 
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PPS: Another 1-stick solution is: 0 - 5 = 5.  You do need to invert your head though. Wink
« Last Edit: May 31st, 2016, 6:21pm by dudiobugtron » IP Logged
Hippo
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Re: stick numbers equality  
« Reply #5 on: Jul 15th, 2016, 2:09pm »
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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.
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rmsgrey
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Re: stick numbers equality  
« Reply #6 on: Jul 16th, 2016, 7:42am »
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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.
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rloginunix
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Re: stick numbers equality  
« Reply #7 on: Jul 16th, 2016, 11:26am »
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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?
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Grimbal
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Re: stick numbers equality  
« Reply #8 on: Jul 19th, 2016, 5:21am »
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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
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Re: stick numbers equality   9m5.png
« Reply #9 on: Jul 19th, 2016, 6:56am »
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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?
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rmsgrey
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Re: stick numbers equality  
« Reply #10 on: Jul 19th, 2016, 7:15am »
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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.
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