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) Add the two lemmas ```lean lemma sInf_eq_zero_iff {s : Set Cardinal} : sInf s = 0 ↔ s = ∅ ∨ ∃ a ∈ s, a = 0 := by ``` and ```lean lemma iInf_eq_zero_iff {ι : Sort*} {f : ι → Cardinal} : (⨅ i, f i) = 0 ↔ IsEmpty ι ∨ ∃ i, f i = 0 := by ``` Feel free to golf. From AperiodicMonotilesLean.
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