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two zeros in the same box
http://www.calcudoku.org/forum/viewtopic.php?f=2&t=608
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Author:  garrybl  [ Sun Jul 13, 2014 5:19 am ]
Post subject:  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?

Author:  clm  [ Sun Jul 13, 2014 9:16 am ]
Post subject:  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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