- #1
trap101
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Let W1 = {A[itex]\in[/itex] MnXn(R)| A = AT} and W2 = {A[itex]\in[/itex] MnXn(R)| A = -AT}
Show that MnXn = W1 (+) W2
where the definition of direct sum is:
V is the direct sum of W1 and W2 in symbols:
V = W1 (+) W2 if:
V = W1 + W2 and
W1 [itex]\cap[/itex] W2 = {0}
Attempt:
I figure I have to show each property individually. So for the first property I tried to do a manipulation:
AT + (-AT) = (A + (-A))T = 0T
Then I added A to each side: A + (A + (-A))T = A + 0T
Did I even show what was needed?
Show that MnXn = W1 (+) W2
where the definition of direct sum is:
V is the direct sum of W1 and W2 in symbols:
V = W1 (+) W2 if:
V = W1 + W2 and
W1 [itex]\cap[/itex] W2 = {0}
Attempt:
I figure I have to show each property individually. So for the first property I tried to do a manipulation:
AT + (-AT) = (A + (-A))T = 0T
Then I added A to each side: A + (A + (-A))T = A + 0T
Did I even show what was needed?