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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., 3cell Lshape "x" cages with two 0's, or even 4cell "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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