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A right-angle bracket in the opposite corner, marking an amalgamated sum.
Also known as: Pushout square mark, Amalgamated sum mark, Cocartesian square mark
The pushout corner is drawn at the bottom-right of a commutative square and asserts the dual construction to a pullback: the object glued together from two others along a shared piece. It is how a diagram states that a space was built by attaching, without prose.
Marks a commutative square as a pushout: the corner object is the amalgamated sum of the two maps out of the shared source.
Contexts: Mathematics
Is the categorical dual of the pullback, and the two are distinguished in a drawing purely by which corner the mark sits in.
Contexts: Mathematics
Two short straight strokes meeting at a right angle, drawn small inside the far corner of a square of arrows.