I have some confusion in Apostol calculas volume $1$
My doubt is given below 
2026-03-26 22:12:04.1774563124
How $u$ equal $0$?
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The vector $N$ is orthogonal to $X-P$, to $A$ and to $B$. Therefore,$$0=N.(X-P)=N.(sA+tB+uN)=u\|N\|^2.$$