The given expression $\{2 x \mid x \in I\}$ represents a set of all numbers that are twice an integer. To generate this set in Python, we can use a list comprehension to iterate over a range of integers and multiply each by 2.
Step 1: Define the Set of Integers
We start by defining a set of integers \( I \) within a specific range. For this example, we choose the range from \(-10\) to \(10\).
Step 2: Generate the Set of Twice the Integers
We then generate a new set by multiplying each integer \( x \) in the set \( I \) by \( 2 \). This can be represented as:
\[
\{2x \mid x \in I\}
\]
Step 3: List the Elements of the New Set
The elements of the new set are:
\[
\{0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, -20, -18, -16, -14, -12, -10, -8, -6, -4, -2\}
\]