# Lower-case blackboard bold displays inconsistently

Lower-case blackboard bold (\mathbb) letters display inconsistently for different users: for me, they display (incorrectly, I assume) as plain Latin font. See example below. I'm on Chrome 68.0.3440.106 on Ubuntu Linux.

However, at least one other user sees the lower-case characters as expected, in blackboard bold. See this comment for an image.

Is this intended behavior? Why is there a discrepancy in how these characters display? I know that in LaTeX, \mathbb is not supported for lower-case letters (if I recall correctly), but it seems to be partially supported now in MathJax.

# Example

MathJax code:

\begin{align*}
&\mathbb{ABCDEFGHIJKLMNOPQRSTUVWXYZ} \\
&\mathbb{abcdefghijklmnopqrstuvwxyz} \\
\end{align*}


Rendered:

\begin{align*} &\mathbb{ABCDEFGHIJKLMNOPQRSTUVWXYZ} \\ &\mathbb{abcdefghijklmnopqrstuvwxyz} \\ \end{align*}

What I see: Only the capital letters and lower-case $k$ display as blackboard bold font. See the following image:

• P.S. I see the same thing on my mobile phone (Chrome on Android). – 6005 Aug 16 '18 at 21:01
• Upper case blackboard bold are really the only ones specified by Knuth. Plus $k$. So whoever added the extra lower case letters, depended on you to have to proper fonts. – GEdgar Aug 17 '18 at 0:25
• I see the rendered text the same way @6005 sees it. I'm using Microsoft Edge 42.17134.1.0 on Windows 10. – Joel Reyes Noche Aug 17 '18 at 1:10

• So blackboard bold has only one lowercase glyph for $\Bbb k$, and the rest are just Roman? – Asaf Karagila Aug 17 '18 at 15:19