\[L_{AABB}=-logI_o\cup(\hat{R},R^\star)=-log\frac{\mid\hat{R}\cap{R^\star}\mid}{\mid\hat{R}\cup{R^\star}\mid}\]\label{one}\]
how to add equation number?
equation
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\vert
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\log
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equationenvironment. – Apr 06 '19 at 06:22\midin the present context; instead, use\vert, or just type|. The whitespace inserted around the\mid-vertical bars is typographically inappropriate. – Mico Apr 06 '19 at 06:41\lognotlog– David Carlisle Apr 06 '19 at 10:04