Multiplication table in Indian mathematics
In Indian mathematics, a Vedic square is a variation on a typical 9 × 9 multiplication table where the entry in each cell is the digital root of the product of the column and row headings i.e. the remainder when the product of the row and column headings is divided by 9 (with remainder 0 represented by 9). Numerous geometric patterns and symmetries can be observed in a Vedic square, some of which can be found in traditional Islamic art. 
Algebraic properties.
The Vedic Square can be viewed as the multiplication table of the monoid formula_1 where formula_2 is the set of positive integers partitioned by the residue classes modulo nine. (the operator "formula_3" refers to the abstract "multiplication" between the elements of this monoid).
If formula_4 are elements of formula_1 then formula_6 can be defined as formula_7, where the element 9 is representative of the residue class of 0 rather than the traditional choice of 0.
This does not form a group because not every non-zero element has a corresponding inverse element; for example formula_8 but there is no formula_9 such that formula_10.
Properties of subsets.
The subset formula_11 forms a cyclic group with 2 as one choice of generator - this is the group of multiplicative units in the ring formula_2. Every column and row includes all six numbers - so this subset forms a Latin square.
From two dimensions to three dimensions.
A Vedic cube is defined as the layout of each digital root in a three-dimensional multiplication table.
Vedic squares in a higher radix.
Vedic squares with a higher radix (or number base) can be calculated to analyse the symmetric patterns that arise. Using the calculation above, formula_13. The images in this section are color-coded so that the digital root of 1 is dark and the digital root of (base-1) is light.
References.
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