Weak Pullbacks
A weak pullback of a cospan X → Z ← Y is a cone over the cospan that is only weakly universal, that is, the mediating morphism u : Q → P above need not be unique.
Read more about this topic: Pullback (category Theory)
Famous quotes containing the word weak:
“What greater reassurance can the weak have than that they are like anyone else?”
—Eric Hoffer (1902–1983)