| 词汇 | pullback |
| 释义 | pullback noun[ C ] uk /ˈpʊlbæk/us ECONOMICS, FINANCE a reduction in the amount of money that a company or person spends: a pullback in spending/lending/hiringa massive pullback in consumer spending The pullback will affect not only our own company but also those with whom we do business. STOCK MARKET a situation in which prices fall suddenly from a high level: The market is overextended and ready for a major pullback. Examples of pullbackpullback Furthermore, since the bottom, front and top squares are pullbacks, the back square is also a pullback. This category has weak pullbacks and setindexed products, but, in general, no pullbacks. The interior operation is not assumed to be natural; that is, it is not assumed to commute with pullbacks. First it can be easily checked that the following diagram is a pullback. For example, collections can be zipped if and only if the monad's endofunctor preserves pullbacks. We will also have use for inverse images, which are pullbacks of two morphisms at least one of which is a monomorphism. The role of pullbacks in categorical interpretations of logic is to perform substitution of terms into predicates and formulas. Let be a weak inclusive category that has pullbacks. The gist of affine equivalence techniques is to use these estimates in combination with the pullback formulas (2.16)-(2.19) for vector proxies. Techniques based on the pullback of differential forms are instrumental in getting interpolation estimates. Let us note a general 2-categorical fact, that pullback functors between slices preserve existing exponentials. For the rest, we add as before the pullback tiles that provide the coordination mechanism about local instantiations. Then (1) is a pullback if and only if it satisfies the reduced chain-condition and f, g is monomorphic. Indeed, to interpret substitution, we need to find a canonical choice of pullbacks that is functorial and is strictly preserved by the categorical structure. Here we require that the category must be at least lex, since we want to interpret substitution via pullback. See all examples of pullback These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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