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Question: Very strange behavior of set of vectors

Question:Very strange behavior of set of vectors

Konstantin@ 215 Maple 18
vector
December 18 2014
1

I experienced strange operation of "union" for sets of vectors.

Mt1:=Matrix(2, 4, [[ 0,1, 0, 0], [ 0,  0,  1, 1]]); Ms := Vector[column](4, [8,4,2,1]); St1 := {}:

St1:= `union`(St1, {Mt1 . Ms});

I am surprised, because each execution of union adds new and the same vector <4 | 3> to set St1:

1

But after copying any set in the clipboard and pasting the set St1 has only one instance of vector <4 | 3>:

2

What does it mean?
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