📚 Recommended Mathematics Books
Topology (Munkres) | General Topology (Engelking) | Counterexamples in Topology | Rudin's AnalysisAs an Amazon associate, I earn from qualifying purchases.
There are two changes in Products in dagger categories with complete ordered Mor-sets draft article:
1. I’ve removed the section on relation of subatomic product with categorical product saying that for funcoids they are the same. No, they are not the same. My claim that they are the same was false.
2. Added section “Special case of funcoids” with a theorem and two new open problems:
Proposition $latex \prod^{\mathsf{FCD}} a \mathrel{\left[ \prod f \right]} \prod^{\mathsf{FCD}} b \Leftrightarrow \forall i \in \mathrm{dom}\, f : a_i \mathrel{[ f_i]} b_i$ for an indexed family $latex f$ of funcoids and indexed families $latex a$ and $latex b$ of filters where $latex a_i \in \mathfrak{F} ( \mathrm{Src}\, f_i)$, $latex b_i \in \mathfrak{F} ( \mathrm{Dst}\, f_i)$ for every $latex i \in \mathrm{dom}\, f$.
Conjecture $latex \left\langle \prod f \right\rangle x = \prod^{\mathsf{FCD}}_{i \in \mathrm{dom}\, f} \langle f_i \rangle \Pr^{\mathsf{FCD}}_i x$ for an indexed family $latex f$ of funcoids and $latex x \in \mathrm{atoms}^{\mathsf{FCD} ( \lambda i \in \mathrm{dom}\, f : \mathrm{Src}\, f_i)}$ for every $latex n \in \mathrm{dom}\, f$.
A weaker conjecture:
Conjecture $latex \langle f \times g \rangle x = \langle f \rangle \mathrm{dom}\, x \times^{\mathsf{FCD}} \langle g \rangle \mathrm{im}\, x$ for funcoids $latex f$ and $latex g$ and $latex x \in \mathrm{atoms}^{\mathsf{FCD} ( \mathrm{Src}\, f ; \mathrm{Src}\, g)}$.
🔬 Advanced Mathematics References
- Sheaves in Geometry and Logic
- Categories for the Working Mathematician
- Stone Spaces
- Algebraic Topology (Hatcher)
- Concrete Mathematics
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I hastened. The prior statement that subatomic product of funcoids coincides with categorical product was indeed true. Consequently the above conjectures are also true.