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{\displaystyle {\mathrm {A} {}\mathrel {\xrightarrow[{\text{text below}}]{\text{text above}}} {}\mathrm {B} }} en.wikipedia.org Visit source
{\displaystyle {\mathrm {A} {}\mathrel {\xrightarrow {\mathrm {text} } } {}\mathrm {B} }} en.wikipedia.org Visit source
{\displaystyle {\mathrm {A} {}\mathrel {\longLeftrightharpoons } {}\mathrm {B} }} en.wikipedia.org Visit source
{\displaystyle {\mathrm {A} {}\mathrel {\longRightleftharpoons } {}\mathrm {B} }} en.wikipedia.org Visit source