Note that interchanges the rows and the columns of any mini-Sudoku. It sends
Row 1 to Column 1, Row 2 to Column 2, etc. This implies also that interchanges
row symmetries and column symmetries. For example, if 2 R is the row symmetry
which interchanges Row 1 and Row 2, then = is the column symmetry which
interchanges Column 1 and Column 2. This equation can be written as = ,
which shows that, even though does not commute with elements of RC, it does
so at the cost of interchanging rows and columns. As a consequence, any symmetry
which can be obtained by composing and elements of R C in any order can be
written in the form with 2 RC. (The same symmetry can also be written in
the form with 2 RC where and are the same except for the interchange
of rows and columns.)
Note that interchanges the rows and the columns of any mini-Sudoku. It sends
Row 1 to Column 1, Row 2 to Column 2, etc. This implies also that interchanges
row symmetries and column symmetries. For example, if 2 R is the row symmetry
which interchanges Row 1 and Row 2, then = is the column symmetry which
interchanges Column 1 and Column 2. This equation can be written as = ,
which shows that, even though does not commute with elements of RC, it does
so at the cost of interchanging rows and columns. As a consequence, any symmetry
which can be obtained by composing and elements of R C in any order can be
written in the form with 2 RC. (The same symmetry can also be written in
the form with 2 RC where and are the same except for the interchange
of rows and columns.)
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