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Update how_it_works.md #672

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Update how_it_works.md
vpuri3 Nov 15, 2023
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Update docs/src/dev/how_it_works.md
vpuri3 Jan 1, 2024
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5 changes: 3 additions & 2 deletions docs/src/dev/how_it_works.md
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Expand Up @@ -56,8 +56,9 @@ learn about [hyper-dual numbers](https://arc.aiaa.org/doi/abs/10.2514/6.2011-886
which extend dual numbers to higher orders by introducing extra ``\epsilon`` terms that can
cross-multiply. ForwardDiff's `Dual` number implementation naturally supports hyper-dual
numbers without additional code by allowing instances of the `Dual` type to nest within each
other. For example, a second-order hyper-dual number has the type `Dual{T,Dual{S,V,M},N}`, a
third-order hyper-dual number has the type `Dual{T,Dual{S,Dual{R,V,K},M},N}`, and so on.
other. For example, a second-order hyper-dual number has the type `Dual{T,Dual{S,V,M},N}`,
and can be formed as follows: `Dual(Dual(x, one(eltype(x))), one(eltype(x)))`. A third-order
hyper-dual number has the type `Dual{T,Dual{S,Dual{R,V,K},M},N}`, and so on.

## ForwardDiff's API

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