User blog comment:XXxKennyDashxXx/A NEW NOTATION! HBAN./@comment-5029411-20141227133837

&[x] = 10^^x ~ f_4(x)

&[x][2] = &[&[...[&[&[x]]]...]] = 10^^^x ~ f_5(x)

&[x][x] ~ f_w(x)

&[x][x][2] ~ f_w+1(x)

&[x][x][x] ~ f_w*2(x)

&{1}[x] ~ f_w^2(x)

&{1}[x][x] ~ f_w^2+w(x)

&{1}{1}[x] ~ f_w^2*2(x)

&{2}[x] ~ f_w^3(x)

&{x}[x] ~ f_w^w(x)