Definition 4.6.3. We say the category $\mathcal{C}$ has fibre products if the fibre product exists for any $f\in \mathop{\mathrm{Mor}}\nolimits _{\mathcal C}(x, y)$ and $g\in \mathop{\mathrm{Mor}}\nolimits _{\mathcal C}(z, y)$.

There are also:

• 4 comment(s) on Section 4.6: Fibre products

In your comment you can use Markdown and LaTeX style mathematics (enclose it like $\pi$). A preview option is available if you wish to see how it works out (just click on the eye in the toolbar).