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Covariant vectors?

So I'm researching something called the Dirac Equation and it uses Feynman Slash Notation, which in turn uses the summation of these things called covariant vectors. From what I thought I understood, isn't covariance just, like, properties of vectors that increase alongside another property of another vector? I tried researching it and it said that covariant vectors are one-forms, and a "mapping" ...

So I'm researching something called the Dirac Equation and it uses Feynman Slash Notation, which in turn uses the summation of these things called covariant vectors. From what I thought I understood, isn't covariance just, like, properties of vectors that increase alongside another property of another vector? I tried researching it and it said that covariant vectors are one-forms, and a "mapping" of vectors to scalars. I'm unsure on what that means. So in short, what components of a vector would be put for covariant vectors if I were to sum up its, what I presume to be, covariant components? Vector products or something?

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