And As the spectrum of the discrete time sign, this identical spectrum will periodically repeat if we prolonged the frequency larger beyond $f_s$ these which the spectrum proven is also precisely the same spectrum in just about every frequency band from $nf_s$ to $(n+1)f_s$ for just about any integer $n$. https://girlspginsector15part2.blogspot.com/2025/07/affordable-boys-pg-in-gurgaon-sector-15.html