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We know that if we want to do a change of variable on multiple integral, characteristic method on pde, change of variable on finding Probability DF (continuous distribution), etc

Why we use Jacobian? What exactly Jacobian is? What is the representation of this? Thanks.

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marked as duplicate by Hans Lundmark, YuiTo Cheng, Leucippus, Yanior Weg, Conifold Jun 22 at 8:53

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