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## Homework Statement

##{\Lambda_c}^b## is a Lorentz transformation and ##{\Lambda^c}_b## is its inverse, so ##{\Lambda_c}^b {\Lambda^c}_b## gives an identity matrix.

How can I write this, assuming it's possible, in terms of ##\delta##'s ?

## Homework Equations

## The Attempt at a Solution

##{\Lambda_a}^b {\Lambda_c}^a =\delta^b_c ##

Wrong.

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