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Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
| of a zero), a future refactor should give `Space d` only the instance of an `AddTorsor` | ||
| (an affine space) which does not require the choice of a zero. This has not been done | ||
| yet since `fderiv` requires a `Module` instance. | ||
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| Similarly, `Norm` `InnerProductSpace` instances should be replaced by the `MetricSpace` instance giving directly the Euclidean distance. |
if only "physical" quantities are allowed.
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NormedAddTorsor is probably the right thing to mention.
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I've updated this, would appreciate it if one of you could check what I have written.
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Co-authored-by: Yoh Tanimoto <57562556+yoh-tanimoto@users.noreply.github.com>
Co-authored-by: Yoh Tanimoto <57562556+yoh-tanimoto@users.noreply.github.com>
Co-authored-by: Yoh Tanimoto <57562556+yoh-tanimoto@users.noreply.github.com>
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| There is a choice between defining `Space d` as an `abbrev` of `EuclideanSpace ℝ (Fin d)`, | ||
| as a `def` of a type with value `EuclideanSpace ℝ (Fin d)` or as a structure | ||
| with a field `val : Fin d → ℝ`. |
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Arguably val : EuclideanSpace ℝ (Fin d) is a nicer option here, which means you don't have to redefine all the structure.
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But I think it means you have to use WithLp.ofLp etc. everywhere. Could one not get the same benefit in terms of structure by defining an equivalence from Space d to EuclideanSpace ℝ (Fin d)?
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Can you give an example of where you'd need to write WithLp.ofLp? I think it's registered as a function coercion so that you don't have to write it.
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My bad, I meant WithLp.toLp, I agree that you shouldn't need WithLp.ofLp
Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
3 participants
Improving the documentation on
Spacein accordance with the conversation here:https://leanprover.zulipchat.com/#narrow/channel/479953-PhysLean/topic/Space.20vs.20EuclideanSpace/with/575332888