Time series smoothingWhy is it called Single Exponential Smoothing?

SF4 = aA3 + (1- a) (aA2 + (1- a) SF2)

= aA3 + a(1- a)A2 + (1- a)2 SF2

But SF2 = aA1 + (1- a) SF1 \

SF4 = aA3 + a(1- a)A2 + (1- a)2(aA1 +(1- a) SF1)

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