The identity laws ( together with the commutative laws ) say that, just like 0 and 1 for addition and multiplication, ?and "'U "'are the identity elements for union and intersection, respectively.
12.
In theoretical physics, a "'non-abelian gauge transformation "'means a gauge transformation taking values in some group " G ", the elements of which do not obey the commutative law when they are multiplied.
13.
In the Algebra preface of his book " Precalculus Mathematics in a Nutshell ", Professor George F . Simmons wrote that the New Math produced students who had " heard of the commutative law, but did not know the multiplication table ."
14.
This is called'the half angle rule'. ( This complication is one of the most difficult aspects of Listing's law to understand, but it follows directly from the non-commutative laws of physical rotation, which specify that one rotation followed by a second rotation does not yield the same result as these same rotations performed in the inverse order .)
