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Enriched completeness is cotensors plus small conical limits
Statement
Assume is symmetric monoidal right closed, locally small, complete, and cocomplete. A -category is complete in the enriched sense if and only if it has all cotensors and all small conical enriched limits.
Facts & Assumptions
Given: A base as in the statement and a -category .
Cotensors are the one-object enriched weighted limits (Tensor and cotensor in a V-category).
Conical enriched limits are the constant-unit weighted enriched limits (Conical enriched limit).
Enriched weighted limits are the general notion of enriched limit (Enriched weighted limit).
Proof
If is enriched complete, then it has every enriched weighted limit by [L3]. In particular it has the one-object weights of [L1] and the constant-unit weights of [L2], so it has all cotensors and all small conical limits.
Conversely, assume has all cotensors and all small conical limits. For a small weight and diagram , form the enriched end Its standard equalizer presentation uses a small product of the displayed cotensors and a small product of cotensors encoding the two action maps for every ordered pair of objects of . All those cotensors exist by hypothesis, and the products and equalizer are small conical limits, so the end exists. Applying and the cotensor identities identifies this end with which is precisely the weighted-limit universal property of [L3].
Therefore enriched completeness is equivalent to the joint existence of cotensors and all small conical enriched limits.
Depends on
Used by
Dependency tree · two levels
9 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.
Sources
- G. M. Kelly, Basic Concepts of Enriched Category Theory, Theorem 3.73 (standard reference, not scraped)
- Emily Riehl, Categorical Homotopy Theory, Corollary 7.6.4 (standard reference, not scraped)