} \NC \overleftrightarrow{text} \NC\NR
\NC \tex{overtwoheadleftarrow} \NC \overtwoheadleftarrow{text} \NC\NR
\NC \tex{overtwoheadrightarrow} \NC \overtwoheadrightarrow{text} \NC\NR
\NC \tex{texoverleftharpoondown} \NC \overleftharpoondown{text}\NC\NR
\NC \tex{overleftharpoonup} \NC
} \NC\NR
\NC \tex{overrightarrow} \NC \overrightarrow{text} \NC\NR
\NC \tex{overleftrightarrow} \NC \overleftrightarrow{text} \NC\NR
\NC \tex{overtwoheadleftarrow} \NC \overtwoheadleftarrow{text} \NC\NR
\NC \tex{overtwoheadrightarrow} \NC \overtwoheadrightarrow
{\overleftrightarrow{A}}$ $b_{\overleftrightarrow{ABC}}$
As an added bonus:
\definemathoverarrow [overtwoheadrightarrow] [\twoheadrightarrowfill]
\definemathoverarrow [overtwoheadleftarrow] [\twoheadleftarrowfill]
\definemathoverarrow [overrightharpoondown] [1pt] [\rightharpoondownfill
[overtwoheadrightarrow] [\twoheadrightarrowfill]
\definemathoverarrow [overtwoheadleftarrow] [\twoheadleftarrowfill]
\definemathoverarrow [overrightharpoondown] [1pt] [\rightharpoondownfill]
\definemathoverarrow [overrightharpoonup] [\rightharpoonupfill]
\definemathoverarrow
up in the core (including the added
bonus if possible ;).
As an added bonus:
\definemathoverarrow [overtwoheadrightarrow] [\twoheadrightarrowfill]
\definemathoverarrow [overtwoheadleftarrow] [\twoheadleftarrowfill]
\definemathoverarrow [overrightharpoondown] [1pt
]
$\overleftarrow{A}$ $\overleftarrow{ABC}$
$a_{\overleftarrow{A}}$ $b_{\overleftarrow{ABC}}$
$\overleftrightarrow{A}$ $\overleftrightarrow{ABC}$
$a_{\overleftrightarrow{A}}$ $b_{\overleftrightarrow{ABC}}$
As an added bonus:
\definemathoverarrow [overtwoheadrightarrow] [\twoheadrightarrowfill
