Hey Simon,

I am very sorry for my sloppy proofs.

I have gone back and tried to fix up my formatting in one of my proofs.

I thought

$\begin{eqnarray} & A \\\\ & \iff \\\\ & B \\\\ & \iff \\\\ & C \\\\ & \iff \\\\ & D \end{eqnarray}$

looks better on a mobile phone than

\begin{align} A & \iff B \\\\ & \iff C \\\\ & \iff D \end{align}

Since for wide expressions the latter tends to fly off the screen.

However, I will use the latter format because you are right, it is more conventional.