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Decomposizione di un vettore
Assegnati due vettori non paralleli [b]u[/b] e [b]v[/b] ogni altro vettore [b]w[/b] puo' essere espresso come somma di due vettori [b]f[/b] e [b]z[/b] paralleli a [b]u[/b] e [b]v[/b].