Discrete convolution help

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WSUBG

Joined Jun 12, 2021
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Hi, can someone explain to me the fundamentals of the reduction in step 2 of this symbolic convolution example?
 

WBahn

Joined Mar 31, 2012
29,823
The fifth line is merely applying the distributive law of multiplication over addition.

(a+b)c = ac + bc

followed by breaking the summation into to parts

sum_over_limits(a - b) = sum_over_limts(a) - sum_over_limits(b)
 
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