With this idea for describing a finite set of sets, it is easy to generalize the concept to a certain infinite family 𝒮₂ of sets 𝒮₂=A_i|i∈N=A_1,A_2,A_3,…,A_n,…. Once again, the power of set builder notation triumphs. The sets 𝒮₁ and 𝒮₂ may be described more precisely with set builder notation than by enumeration.

This is a nonrights issue.

A moving platform scheme[…]is more technologically ambitious than maglev trains even though it relies on conventional rails. Local trains would use side-by-side rails to roll alongside intercity trains and allow passengers to switch trains by stepping through docking bays.

Here they are, the fans voted for them, and here they are, the Mons that can...