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...\mathbf{N} \} \cup \{ 0 \}$), all reflexive spaces (cf. [[Reflexive space|Reflexive space]]; take $K$ to be the unit ball), all spaces $L _ { 1 } ( \mu )$ if $ ...(X )$, i.e., $\operatorname{dens} (X )$ is the smallest [[Cardinal number|cardinal number]] $\kappa$ for which $X$ has a dense subset of cardinality $\kappa$.

...logical deduction|Natural logical deduction]]). Evidently, deducibility is reflexive and transitive, and this translates into the identity deduction $1_A\colon ...gory $\mathcal A$ is said to be accessible if there is an infinite regular cardinal number $\kappa$ and a small full subcategory $\mathcal B$ consisting of $\k