User blog comment:Wythagoras/Dollar function part 1/@comment-25418284-20130605055940

Good work. Your rules are a little unclear; here's my attempt at cleaning them up:


 * \(a\$b\bullet = (a + b)\$\bullet\)
 * \(a\$\bullet [0]\bullet = a\$\bullet a\bullet\)
 * \(a\$\bullet [n + 1]\bullet = a\$\bullet [n][n]\ldots[n][n]\bullet\) with \(a\) copies.

Here the \(\bullet\) represents the remainder of the array. (I find it less visually distracting than the conventional @ sign.)