Finally, we prove that the typing problem for the trust (lambda )-calculus is decidable, that is, we prove that, given a typing context (Gamma ) and term (e), it is decidable whether there exists a type (tau ) such that (Gamma vdash ^{D} e,tauau ).
Return a type if there exists a type that is exactly equal to the duration of the provided quarterLength.
Intuitively, this theorem means that either there exists a type (t) such that has_type_alg ctx e t is provable or there is no such type t.
When j → k, there exists a type of retail format that satisfies the following conditions: relatively complete types of merchandise, a relatively high price level, low quality service and close distance, which explains the existence of the grocery store.
There exists a type of retail format which satisfies the following conditions: relatively complete types of merchandise, a relatively high price level, service of high quality and remote distance (longer than the whole distance of decentralized purchasing).
(1) When j → k (one-stop shopping), there exists a type of retail format that satisfies the following conditions: relatively more types of merchandise, a relatively low price level, medium quality service and remote distance. .
When j → k (one-stop shopping), there exists a type of retail format that satisfies the following conditions: relatively more types of merchandise, a relatively low price level, medium quality service and remote distance.
(2) When j → 1, there exists a type of retail format that satisfies the following conditions: relatively fewer types of merchandise, a relatively low price level, service of medium quality and remote distance, which explains the existence of the suburban storage center.
When j → 1 and the service is of high quality, there exists a type of retail format that satisfies the following conditions: relatively fewer types of merchandise, a relatively low price level, high quality service and remote distance, which explains the existence of the brand discount store.
(3) When j → 1 and the service is of high quality, there exists a type of retail format that satisfies the following conditions: relatively fewer types of merchandise, a relatively low price level, high quality service and remote distance, which explains the existence of the brand discount store. .
