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Code

def fib(n: int) -> int:
    """Return the n-th Fibonacci number."""
    a, b = 0, 1
    for _ in range(n):
        a, b = b, a + b
    return a

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Math

Inline: eiπ+1=0 e^{i\pi} + 1 = 0 .

Display:

∑k=1nk=n(n+1)2 \sum_{k=1}^{n} k = \frac{n(n+1)}{2}