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In litterature, I have noticed some authors write the dispersion for the d-wave gap as Δ(k)=Δ[cos(k_{x})-cos(k_{y})]/2, and some write it as Δ(k)=2Δ[cos(k_{x})-cos(k_{y})]. Where does this difference come from?

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# Superconducting d-wave dispersion

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