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A comment on First-Class Automatic Differentiation in Swift. Parent comment

Re:First-Class Automatic Differentiation in Swift by nestorD on Monday October 22, 2018 @03:57AM (#18272916)
And if you want the second derivative... You have hyper-dual numbers! http://adl.stanford.edu/hyperdual/
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Re:First-Class Automatic Differentiation in Swift by banach on Monday October 22, 2018 @12:05PM (#18275828)
Why settle for two, when you can have them all? https://link.springer.com/article/10.1023/A:1011501232197
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Re:First-Class Automatic Differentiation in Swift by eigenspace on Monday October 22, 2018 @10:01AM (#18274689)
That’s not normally necessary. One can often just use tagged dual numbers.

I guess one might consider tagged duals hyperduals.

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Re:First-Class Automatic Differentiation in Swift by adamnemecek on Monday October 22, 2018 @10:06AM (#18274730)
What’s a tagged number? Google isn’t helpful.
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