commutative
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Commutative 
from
MathWorld
Two
elements
x
and
y
of
a
set
S
are
said
to
be
commutative
under
a
binary
operation *
if
they
satisfy
x
*y =
y
*x.
Real
numbers
are
commutative
under
addition
x
+y =
y
+x...
mathworld.wolfram.com/Commutative.html 
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Commutative.
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040909
...
M21k
XK
=
KX
? 040909
...
Mathematically:
XK
=
KX
iff
K
&
X
are
"Commutative" 040909
...
.
M
Note
:
XK
=
X
*K &
KX
=
K
*X,
where
*
is
a
binary
operation... 040909
040909
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