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**1. Homework Statement**

Hi, I can't seem to understand the following formula in my professor's lecture notes:

F_αβ = g_αγ*g_βδ*F^(γδ)

**2. Homework Equations**

Where g_αβ is the diagonal matrix in 4 dimensions with g_00 = 1 and g_11 = g_22 = g_33 = -1 and F^(γδ) is the electromagnetic tensor with c=1.

**3. The Attempt at a Solution**

I keep wanting to perform matrix multiplication, but g_αγ*g_bδ would just be the unit matrix if we did this, right? I don't understand how to perform the RHS of this equation...