**Schur's Theorem (1924):**
Let `f_n(x) = ∑_{j=0}^n x^j/j!` be the `n`-th truncated
exponential polynomial over `ℚ`. Then for `n ≥ 2`:
- If `n ≡ 0 (mod 4)`, the Galois group of `f_n` is isomorphic to the alternating group `A_n`
- If `n ≢ 0 (mod 4)`, the Galois group of `f_n` is isomorphic to the symmetric group `S_n`
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