Square Image Of (⊏)

⊏ 𝕩: First Cell

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First major cell of 𝕩.

    ⊏ ⟨1, 2, 3⟩
┌·   
· 1  
    ┘

    a ← 3‿3 ⥊ ↕9

    ⊏ a
⟨ 0 1 2 ⟩

𝕨 ⊏ 𝕩: Select

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Select the major cells of 𝕩 at the indices in 𝕨.

    2‿0 ⊏ ⟨1, 2, 3⟩
⟨ 3 1 ⟩

    b ← 3‿3 ⥊ ↕9

    2‿0 ⊏ b
┌─       
╵ 6 7 8  
  0 1 2  
        ┘