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Question: Check Matrix argument when entering a procedure

Question:Check Matrix argument when entering a procedure

sigl1982 95 Maple 18
matrix
April 10 2017
2

Hello,

To check my arguments in a procedure I need something like

myproc := proc(M :: Matrix(square, rational)

                       , N :: Matrix(shape=triangular[lower, unit], datatype = rational
                       , O :: Matrix(shape = square, dimension = 5

               )

end proc;

How does that work in Maple? What is the correct Syntax? I tried many different things that doesn't fit.
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