2⁢K⁢k⁢cd⁡(2⁢K⁢t,k)=∑n=-∞∞πsin⁡(π⁢(t+12-(n+12)⁢τ))=∑n=-∞∞(∑m=-∞∞(-1)mt+12-m-(n+12)⁢τ),