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What relation between two sets S and T must hold so that | S T | = | S | + | T | .

What relation between two sets

S

and

T

must hold so that

| S T | =

| S | + | T | .

Show that if

S_{1} s u b e S_{2}

then

\frac{?}{b a r} (S_{2}) s u b \frac{e}{b} a r (S_{1}) .

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