Esempi monolingue (non verificati dalla Redazione di PONS)

inglese
The index-less transformation properties of a tensor are given by pullbacks for covariant indices, and pushforwards for contravariant indices.
en.wikipedia.org
This shows that pullbacks exist in any category with binary products and equalizers.
en.wikipedia.org
The pullback of bundles then corresponds to the inverse image of sheaves, which is a contravariant functor.
en.wikipedia.org
The composition of morphisms is given by pullback.
en.wikipedia.org
One can therefore talk about lifting products, equalizers, pullbacks, etc.
en.wikipedia.org
The pullback motor was wound up by pressing down the rear of the car and rolling it forwards and backwards on its wheels.
en.wikipedia.org
The 1-forms and are defined to be the pullbacks of the other two.
en.wikipedia.org
And then, when the overbought chatter is done, we often get a bigger pullback.
realmoney.thestreet.com
The pullback is naturally defined as the dual (or transpose) of the pushforward.
en.wikipedia.org
We have had an uninterrupted series of successes, without a single pullback.
en.wikipedia.org

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