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        riddles >> medium >> stick numbers equality
        
(Message started by: riddler358 on May 28^th, 2016, 6:24am)

Title: stick numbers equality
Post by riddler358 on May 28^th, 2016, 6:24am

with a least number of stick moves make proper equality

Title: Re: stick numbers equality
Post by pex on May 28^th, 2016, 6:28pm

Two moves is possible... Can it be done in one?

Title: Re: stick numbers equality
Post by riddler358 on May 29^th, 2016, 2:45am

very neat solution and very good question - yes, it's possible in 1

Title: Re: stick numbers equality
Post by rmsgrey on May 29^th, 2016, 4:57am

[hide] 5 = 5 = 5 [/hide]

Title: Re: stick numbers equality
Post by dudiobugtron on May 31^st, 2016, 6:20pm

It's already a proper equality; no need to move anything. PS: [hide]g = 10[/hide]

---------------
PPS: Another 1-stick solution is: [hide]0 - 5 = 5. You do need to invert your head though.[/hide] ;)

Title: Re: stick numbers equality
Post by Hippo on Jul 15^th, 2016, 2:09pm

on 05/29/16 at 04:57:15, rmsgrey wrote:

[hide] 5 = 5 = 5 [/hide]

That would require two moves ... or the equal signs would not be aligned.

[hide]
I suppose 0-5=5 is intended solution. You just must walk around the table.
[/hide]

Title: Re: stick numbers equality
Post by rmsgrey on Jul 16^th, 2016, 7:42am

on 07/15/16 at 14:09:21, 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.

Title: Re: stick numbers equality
Post by rloginunix on Jul 16^th, 2016, 11:26am

If arbitrary geometric transformations are allowed, should not this be another 1-move solution: [hide]9 into 0, rotate (reflect) about a vertical axis or look "behind" for 2=2-0[/hide]?

Title: Re: stick numbers equality
Post by Grimbal on Jul 19^th, 2016, 5:21am

on 07/15/16 at 14:09:21, 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?

Title: Re: stick numbers equality
Post by rloginunix on Jul 19^th, 2016, 6:56am

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 '[hide]equality[/hide]' ([hide]singular[/hide]) [hide]5=5=5[/hide] has '[hide]equalities[/hide]', [hide]plural[/hide]?

Title: Re: stick numbers equality
Post by rmsgrey on Jul 19^th, 2016, 7:15am

on 07/19/16 at 06:56:29, rloginunix wrote:

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.