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## Main Question or Discussion Point

i have two different beam deflection formulas, one for rigid supports and one for simple supports - but i know there are many different ones out there.

i was wondering if anyone could tell me how the formulas were created, oh and also what exactly does moment of inertia have to do with delfection??

i was wondering if anyone could tell me how the formulas were created, oh and also what exactly does moment of inertia have to do with delfection??