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:
“When hearts have one mingled,
Love first leaves the well-built nest;
The weak one is singled
To endure what it once possessed.
O Love! who bewailest
The frailty of all things here,
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For your cradle, your home, and your bier.”
—Percy Bysshe Shelley (1792–1822)