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Fong, Brendan; Spivak, David I. (2018-10-12). "Seven
Sketches in Compositionality: An Invitation to Applied Category Theory".
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183:) whose objects are the 1-cells and morphisms are the 2-cells. The composition in this category is called
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We can reinterpret this monoid as a bicategory with a single object
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Bicategories may be considered as a weakening of the definition of
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68:. The notion was introduced in 1967 by
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418:: F â T.
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620:End
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