\def\longarrownot{\mathrel{\kern5.5mu}\arrownot\mathrel{\kern-5.5mu}} stmaryrd
\def\Longarrownot{\mathrel{\kern5.5mu}\Arrownot\mathrel{\kern-5.5mu}} stmaryrd
\def\Mapsto{\Mapstochar\mathrel{\kern-2mu}\Rightarrow} stmaryrd
\def\longarrownot{\mathrel{\kern5.5mu}\arrownot\mathrel{\kern-5.5mu}} stmaryrd
\def\Longarrownot{\mathrel{\kern5.5mu}\Arrownot\mathrel{\kern-5.5mu}} stmaryrd
\def\Mapsto{\Mapstochar\mathrel{\kern-2mu}\Rightarrow} stmaryrd