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Failed to parse (unknown function "\sumMHLYLDWORK"): {\displaystyle SUMHLYLDWORK^t_{\gamma}=\sumMHLYLDWORK^t_{\gamma,m}}

Failed to parse (unknown function "\sumRSUMHLYLDWORK"): {\displaystyle WORLDDISABILITY^t=\sumRSUMHLYLDWORK^t_{\gamma}}

<math>WORLDWORKPOP^t=\sum^RPOP15TO65^t_{\gamma}