According to wikipedia a matrix (plural matrices) is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns.
Is there any mathematical object which is hexahedral (like cubic) array of numbers?
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student0434
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Yes, in various ways. See for example for a hexagonal grid for $\Bbb Z[\omega]$, or Centered hexagon of integers for sequences, just to name two possibilities. I suppose the question is too broad right now. – Dietrich Burde Mar 15 '22 at 09:54
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In combinatorics, hexagonal arrays are very common, too. See for example Honeycomb Arrays. – Dietrich Burde Mar 15 '22 at 10:01
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@DietrichBurde, I didn't mean hexagon. I mean hexahedral. It is a polyhedron that has six faces like a cubic. – student0434 Mar 15 '22 at 10:19
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So you also mean then not matrices, but "hypermatrices" like cubes? Because you compared with $2$-dimensional square arryas, called matrices. Anyway, these are used also in different contexts. You need to specify what exactly you want. – Dietrich Burde Mar 15 '22 at 10:20
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@DietrichBurde, I mean there is a rectangular array of numbers which called matrix. What about a cubic array of numbers, is there anything like taht in mathematics? – student0434 Mar 15 '22 at 10:22
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1Yes, as I said, they are popular in combinatorics, see here. Your question has been asked in several different variations. See for example also this post and others. – Dietrich Burde Mar 15 '22 at 10:24