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ā[H:jā¢]. ā[phi:{H ā¢ _:š½}]. ā[v:{H, phi ā¢ _}]. (v = (v)iota ā {H, phi ā¢ _})
{ Intros }
1. H : CubicalSet{j}
2. phi : {H ā¢ _:š½}
3. v : {H, phi ā¢ _}
ā¢ v = (v)iota ā {H, phi ā¢ _}