What does " to first order" mean ?

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The term "valid to first order in h" refers to approximations that include both the constant term and the linear term (h^1) in a Taylor series expansion, while excluding higher-order terms (h^k for k>1). In the example provided, g is expressed as g = n + h, where h is significantly smaller than n. This definition is crucial for understanding the precision of approximations in mathematical modeling.

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Hi. When using approximations such as g = n + h where h is much less than n ; what does " valid to first order in h" mean ? Does it mean include terms linear in h or does it mean drop those terms ?
Thanks
 
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It's the former. It's based on the idea of the amount - g in this case - being expressed as a Taylor series in h. To first order means including the constant term and the term that has ##h^1## but excluding all other terms that have ##h^k## for ##k>1##.
 
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