Question

Draw a tetragonal P lattice; place an extra lattice point in (½, ½, 0), i.e., make...

Draw a tetragonal P lattice; place an extra lattice point in (½, ½, 0), i.e., make a C centering of the lattice. Now, show that a tetragonal C lattice does not exist, i.e. that it is equivalent to (another) P lattice

I understand how to draw it, I just don't know how to prove that its equivalent to another P lattice

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