We devise  dynamic algorithms for the following (weak ) visibility polygon computation problems: * Maintaining visibility polygon of a fixed point located interior to  simple polygon amid vertex insertions and deletions to  simple polygon.
<fluency> We devise  dynamic algorithms for the following (weak ) visibility polygon computation problems: * Maintaining visibility polygon of a fixed point located interior to  simple polygon amid vertex insertions and deletions to  simple polygon.
We devise dynamic algorithms for the following (weak ) visibility polygon computation problems: * Maintaining visibility polygon of a fixed point located interior to the simple polygon amid vertex insertions and deletions to simple polygon.