How is the mathematical definition of redshift ($z$) calculated?
Answer
$( ext{λ}_{obs} - ext{λ}_{emit}) / ext{λ}_{emit}$
Redshift is calculated as the difference between the observed wavelength ($ ext{λ}_{obs}$) and the emitted wavelength ($ ext{λ}_{emit}$), divided by the emitted wavelength.
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