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# Why the stress is written as sigma sometimes and as f or F others?

Updated: 11/11/2022

Wiki User

17y ago

Greek and Roman lettering used in formulas is derived from the scientist or theorist that developed the formula. Sigma represents stress directly. When a formula uses a capital or lwercase f, it is referring to stress as a type of force., hence the letter choice.

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17y ago

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Q: Why the stress is written as sigma sometimes and as f or F others?
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