Given R$1$ and R$2$ compute $($If possible$)$ and provide the output $($schema of the table

and content$)$ for the following expressions. Then, compare the result with RelaX:

$R1R2$

$R1R2$

$R1-$ R$2$

R$1/$ R$2$

$R1|><mi\; id="EditorElement\_384326">|</mi><mi\; id="EditorElement\_384328">R</mi><mn\; id="EditorElement\_384330">2</mn>$

R$1|><mi\; id="EditorElement\_384300">|</mi>$

R$1.$ID $$

R$2.$ID R$2$

R$1|><mi\; id="EditorElement\_384253">|</mi><mi\; id="EditorElement\_384255">R</mi><mn\; id="EditorElement\_384257">2</mn>$

$R1|><mi\; id="EditorElement\_384226">|</mi><mi\; id="EditorElement\_384228">R</mi><mn\; id="EditorElement\_384230">2</mn>$

$R1.ID1($R$1R2$

$$ R$1.$A$,$ R$1.$B $($R$1{?}_{|}{?}_{?}$

R$1.$ID $$

R$2.$ID R$2)$

R$1$

R$2$