A First Course in Complex Analysis by Matthias Beck, Gerald Marchesi, Dennis Pixton, and Lucas Sabalka Ch9.1

enter image description here

Circle: $C[z_0,R] = |z-z_0| = R$

Disc: $D[z_0,R] = |z-z_0| < R$

Closed Disc: $\overline{D}[z_0,R] = |z-z_0| \le R$

Punctured disc: $0 < |z-z_0| < R$

How do I do the dot inside the $D$ to denote a punctured disc?

  • 13
    In my opinion, that is a terrible choice of notation. – mrf Aug 16 at 11:02
  • @mrf thanks I guess XD – BCLC Aug 16 at 11:03
  • 3
    I am in agreement with @mrf. That notation is awful–the little dot doesn't really jump out at me, and the profile of the letter isn't changed at all. I might suggest something like $$D^* \qquad\text{or}\qquad \dot D\qquad\text{or}\qquad D_\circ \qquad\text{or}\qquad D'$$ or the like instead. One thing that you should learn early in your mathematical career is not to slavishly follow the notation of others when their notation is clearly not very good. :) – Xander Henderson Aug 16 at 12:04
  • @XanderHenderson THANKS XD – BCLC Aug 16 at 12:13
  • 1
    @XanderHenderson ...clearly not very good and you have no idea how to reproduce it! – user1729 Aug 16 at 15:17
  • 1
    @user1729 Right-click on the math. [Show Math As] $\to$ [TeX Command]. – Xander Henderson Aug 16 at 15:22
  • 6
    You might want to add a link to the same question you asked on Tex StackEschange. – Peter Phipps Aug 16 at 16:15
  • 1
    @Xander I was referring to the notation in the question, which the OP could not reproduced, rather than your comment (whose suggestions are good because they are clear and use pretty standard commands to reproduce). – user1729 Aug 16 at 16:46
  • 2
    As per @PeterPhipps comment, this has been cross-posted on TeX - LaTeX: tex.stackexchange.com/questions/446253/… – Xander Henderson Aug 16 at 17:31
  • @PeterPhipps thanks! – BCLC Aug 17 at 0:03
up vote 2 down vote accepted

$$D\!\!\!\!\cdot$$

For example.

  • 1
    Or ${D\kern-5pt\bullet}\kern2pt$ (using ${D\kern-5pt\bullet}\kern2pt$)? Still terrible notation, if you ask me, but the bullet is a bit easier to read, methinks. – Xander Henderson Aug 16 at 17:27
  • 1
    @Xander: ${D\kern-5pt{\tiny\bullet}}\kern2pt$ is slightly better. Now the vertical alignment is off, though. – Asaf Karagila Aug 16 at 17:28
  • 2
    Indeed, that is marginally better. Still terrible notation. ;) – Xander Henderson Aug 16 at 17:29
  • 1
    Yes. Very terrible, @Xander. – Asaf Karagila Aug 16 at 17:30
  • @XanderHenderson thanks for both the notation and the support XD – BCLC Aug 17 at 0:03

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .