Integral of $$$1$$$ with respect to $$$n$$$
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Your Input
Find $$$\int 1\, dn$$$.
Solution
Apply the constant rule $$$\int c\, dn = c n$$$ with $$$c=1$$$:
$${\color{red}{\int{1 d n}}} = {\color{red}{n}}$$
Therefore,
$$\int{1 d n} = n$$
Add the constant of integration:
$$\int{1 d n} = n+C$$
Answer
$$$\int 1\, dn = n + C$$$A