Template:Extra Maths

$$\newcommand{\bigudot}{ \mathchoice{\mathop{\bigcup\mkern-15mu\cdot\mkern8mu}}{\mathop{\bigcup\mkern-13mu\cdot\mkern5mu}}{\mathop{\bigcup\mkern-13mu\cdot\mkern5mu}}{\mathop{\bigcup\mkern-13mu\cdot\mkern5mu}} }$$ $$\newcommand{\udot}{\cup\mkern-12.5mu\cdot\mkern6.25mu\!}$$ $$\require{AMScd}\newcommand{\d}[1][]{\mathrm{d}^{#1} }$$ This adds \udot and \bigudot commands.

They look like:

• $\cup^a_b$
• $\udot^a_b$, $$\udot^a_b$$ for \udot and
• $\bigudot^a_b$, $$\bigudot^a_b$$ for \bigudot

And

• $A\cup B\cup B$
• $A\udot B\udot B$, $$A\udot B\udot B$$
• $A\bigudot B$, $$A\bigudot B$$

Note: $\udot$ appears not-centered due to sub-pixel problems on desktop/low-DPI displays. I can't see a fix for this