**Math212**is an Applied and Computational Mathematics Website. This website aimed for people or researchers who are studying or dealing with math at higher level and professionals in related fields. Effective mathematics thinking and problem analyzing are major parts in

**Math212**website. We are presenting many mathematical problems in varied topics and/or branches, in order to illustrate any ambiguity in these mathematical topics if existed. In fact, although some topics seem to be simple and clear in its nature and showed no abstruseness, they still need a reasonable mathematical explanation.

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