ℓ and ℓ are the same letter U+2113. Perhaps Petr meant \ell = ℓ = U+2113 and \scrl = 𝓁 = U+1D4C1, which are not normalized to equivalent identifiers (:ℓ != :𝓁).
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ℓ and ℓ are the same letter U+2113. Perhaps Petr meant \ell = ℓ = U+2113 and \scrl = 𝓁 = U+1D4C1, which are not normalized to equivalent identifiers (:ℓ != :𝓁).