👉 In mathematics, a "retrograde" is an operation that reverses the direction of a sequence or process. For example, if you have a list of numbers and want to reverse their order, you can use the following code in Python: ```python numbers = [1, 2, 3] reversed_numbers = numbers[::-1] print(reversed_numbers) ``` This will output: `[3, 2, 1]` because it reverses the order of