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Square Image Of Or Equal To (`⊑`)

`⊑ 𝕩`: First

First element of 𝕩.

    ⊑ ⟨1, 2, 3⟩

    a ← 3‿3 ⥊ ↕9

    ⊑ a

Pick the element of 𝕩 at index 𝕨.

    2 ⊑ ⟨1, 2, 3⟩

    b ← 3‿3 ⥊ ↕9

    2‿0 ⊑ b