Element Of (∊)

∊ 𝕩: Mark Firsts

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Mark the first occurrence of each major cell in 𝕩 with a 1, and all other occurrences with a 0.

    ∊ 4‿5‿6‿6‿4‿7‿5
⟨ 1 1 1 0 0 1 0 ⟩

    a ← 3‿3 ⥊ ↕9

    ∊ a
⟨ 1 1 1 ⟩

𝕨 ∊ 𝕩: Member Of

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Is each cell in 𝕨 a major cell of 𝕩?

    ⟨1⟩ ∊ ↕9
⟨ 1 ⟩

    b ← 3‿3 ⥊ ↕9

    ⟨0‿1‿2⟩ ∊ b
┌·   
· 0  
    ┘

    ⟨1‿3 ⥊ 0‿1‿2⟩ ∊ b
┌·   
· 0  
    ┘