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 two zeros in the same box 
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Posted on: Sun Jul 13, 2014 5:19 am




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Joined: Sun Feb 03, 2013 6:13 pm
Post two zeros in the same box
I was surprised recently to encounter a "0x" instruction with two zeros included in the numbers that made it up.
Is that mathematically sound/kosher? Or did I err in completing the puzzle?


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Posted on: Sun Jul 13, 2014 9:16 am




Posts: 690
Joined: Fri May 13, 2011 6:51 pm
Post Re: two zeros in the same box
garrybl wrote:
I was surprised recently to encounter a "0x" instruction with two zeros included in the numbers that made it up.
Is that mathematically sound/kosher? Or did I err in completing the puzzle?


Yes, it is mathematically valid for a multiplication since 0 x 0 x ... = 0 (not in a ":" cage), in fact it is frequent to find, i.e., 3-cell L-shape "x" cages with two 0's, or even 4-cell "x" cages with two 0's, in this type of "from 0" calcudokus. But we can never divide a 0 by another 0 in the process of "successive" division among the candidates in the cage, that would always produce an indetermination.


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