contravariance中文是什么意思

contrattaque 反击
contrats clefs en main 统包合同启钥合同
contravariant contravariantadj.逆变的contravariantm逆变式
contratiant contratiant,eadj. 不愉快的,生气的;受阻碍的,受挫折的
contravention 音标：[kɔ̃travãsjɔ̃]n.f. 违法,违章,违约,违章罚款,违约罚金专业辞典n.f.【法律】违法，违章，违约：être[se mettre]en~违法，违章，违约contraventionf.违法近义词entorse, infraction, violation, amende, contredanse, papillon, procès-verbal
contratación 孔特拉塔西翁
contravis contravism.更正通知，反通知
contrat à terme 期货合约期货
contrazy 孔特拉齐

However, Sather supported both covariance and contravariance.
The mathematically precise way this happens is detailed at covariance and contravariance of vectors.
See also Covariance and contravariance of vectors.
Contravariance captures the physical intuition behind the idea that a vector has " magnitude and direction ".
:The connoisseurs will undoubtedly point out that I have played a bit loose with the covariance and contravariance.
:Covariance and contravariance ( computer science ) is the Wikipedia article about this, though it could stand improvement.
In some advanced contexts, a row and a column vector have different meaning; see covariance and contravariance of vectors.
The distinction between covariance and contravariance is particularly important for computations with tensors, which often have "'mixed variance " '.
On the other hand, programmers often find contravariance unintuitive, and accurately tracking variance to avoid runtime type errors can lead to complex typing rules.
In tensor analysis, superscripts are used instead of subscripts to distinguish covariant from contravariant entities, see covariance and contravariance of vectors and raising and lowering indices.