Find the identity element in set `Q^+` of all positive rational numbers for the operation * defined by `a*b=(a b)/2` for all `a , b in Q^+dot`

Explanation

To find the identity element in the set \( Q^+ \) (the set of all positive rational numbers) for the operation defined by \( a * b = \frac{ab}{2} \), we need to identify an element \( e \) such that for any \( a \in Q^+ \):

\[ a * e = a \]

### Step 1: Write the equation for the identity element
Using the definition of the operation, we have:
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