user standalone 10bp,margin=1bp \usepackage[T1]{fontenc} inputenc utf8 arrows \leftarrow ← true \leftrightarrow ↔ true \rightarrow → true \mapsto ↦ true \longleftarrow ⟵ true \longleftrightarrow ⟷ true \longrightarrow ⟶ true \longmapsto ⟼ true \downarrow ↓ true \updownarrow ↕ true \uparrow ↑ true \nwarrow ↖ true \searrow ↘ true \nearrow ↗ true \swarrow ↙ true \textdownarrow ↓ textcomp \textuparrow ↑ textcomp \textleftarrow ← textcomp \textrightarrow → textcomp \nleftarrow ↚ true amssymb \nleftrightarrow ↮ true amssymb \nrightarrow ↛ true amssymb \hookleftarrow ↩ true \hookrightarrow ↪ true \twoheadleftarrow ↞ true amssymb \twoheadrightarrow ↠ true amssymb \leftarrowtail ↢ true amssymb \rightarrowtail ↣ true amssymb \Leftarrow ⇐ true \Leftrightarrow ⇔ true \Rightarrow ⇒ true \Longleftarrow ⟸ true \Longleftrightarrow ⟺ true \Longrightarrow ⟹ true \Updownarrow ⇕ true \Uparrow ⇑ true \Downarrow ⇓ true \nLeftarrow ⇍ true amssymb \nLeftrightarrow ⇎ true amssymb \nRightarrow ⇏ true amssymb \leftleftarrows ⇇ true amssymb \leftrightarrows ⇆ true amssymb \rightleftarrows ⇄ true amssymb \rightrightarrows ⇉ true amssymb \downdownarrows ⇊ true amssymb \upuparrows ⇈ true amssymb \circlearrowleft ↺ true amssymb \circlearrowright ↻ true amssymb \curvearrowleft ↶ true amssymb \curvearrowright ↷ true amssymb \Lsh ↰ true amssymb \Rsh ↱ true amssymb \looparrowleft ↫ true amssymb \looparrowright ↬ true amssymb \dashleftarrow ⇠ true amssymb \dashrightarrow ⇢ true amssymb \leftrightsquigarrow ↭ true amssymb \rightsquigarrow ⇝ true amssymb \Lleftarrow ⇚ true amssymb \leftharpoondown ↽ true \rightharpoondown ⇁ true \leftharpoonup ↼ true \rightharpoonup ⇀ true \rightleftharpoons ⇌ true \leftrightharpoons ⇋ true amssymb \downharpoonleft ⇃ true amssymb \upharpoonleft ↿ true amssymb \downharpoonright ⇂ true amssymb \upharpoonright ↾ true amssymb