User blog comment:Primussupremus/More depth in the expansions and theory of my array notation part 1/@comment-31607182-20170517222332/@comment-31390121-20170518065619

I have just thought of a definition:

{a,b,c} = a+c when b=1. If b= then {a,b,c}=a*c.

for b>2= a_(b-2 up arrows) c.

How do you like this.