≍
≍ 𝕩
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Add a dimension to 𝕩.
𝕩
≍ 1 ⟨ 1 ⟩ ≍≍ 1 ┌─ ╵ 1 ┘ ≍≍≍ 1 ┌─ ╎ 1 ┘ ≍≍ 1‿2‿3‿4 ┌─ ╎ 1 2 3 4 ┘ ≍≍≍ 1‿2‿3‿4 ┌─ ┆ 1 2 3 4 ┘
𝕨 ≍ 𝕩
Join 𝕨 and 𝕩 along a newly created axis.
𝕨
1 ≍ 3 ⟨ 1 3 ⟩ 1‿2 ≍ 2‿3 ┌─ ╵ 1 2 2 3 ┘