[hackers] [libzahl] Use bold, not blackboard bold || Mattias Andrée

[git]

commit 04dc4ce9b5dc52fd455de8bcbdfef52321c1e4df
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Fri Apr 29 16:19:58 2016 +0200
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Fri Apr 29 16:19:58 2016 +0200

    Use bold, not blackboard bold
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/doc/refsheet.tex b/doc/refsheet.tex
index d4b5a8a..72f258e 100644
--- a/doc/refsheet.tex
+++ b/doc/refsheet.tex
@@ -128,7 +128,7 @@ Is $b$ a prime?               & {\tt zptest(a, b, c)}      
& {\tt c} runs of Mil
 {}                            & {}                         & $~~~~~$ {\tt 
PRIME} (2)                           \\
 
 \textbf{Random numbers}       & {}                         & {}                
                                \\
-$a \xleftarrow{\$} \mathbb{Z}_d $ & {\tt zrand(a, b, UNIFORM, d)}
+$a \xleftarrow{\$} \textbf{Z}_d $ & {\tt zrand(a, b, UNIFORM, d)}
 & {\tt b} is a {\tt zranddev}, e.g. {\tt DEFAULT\_RANDOM} \\
 \\