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Failed to build Cabal-syntax-3.12.0.0.
```
src/Distribution/Types/ForeignLib.hs:168:13: error:
Ambiguous occurrence ‘’
It could refer to either ‘Distribution.Compat.Prelude.’,
…
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in: https://github.com/twitter/algebird/blob/develop/algebird-core/src/main/scala/com/twitter/algebird/mutable/PriorityQueueMonoid.scala
the issue is that the PriorityQueue holds a reference to the O…
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Going by the definition of Monoid
The following properties are to be satisfied to be called a Monoid
Assosiativity- a op (b op c) = (a op b) op c
Left Identity- zero op a = a
Right Identity a o…
rban1 updated
6 years ago
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In base 4.11, Semigroup was made a superclass of Monoid, with mappend belonging to Semigroup. This results in the following error:
```haskell
src/Text/Digestive/Form/Encoding.hs:42:10: error:
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There are some trivial instances for `Managed` that could be implemented for `Codensity`, the `Monoid` instance is put to good use by Gabriel Gonzales in his [*Applied category theory and abstract alg…
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I recently had a need for a Monoid and Group which also have an [absorbing element](https://en.wikipedia.org/wiki/Absorbing_element) *a* defined by
```
combine(a, x) === combine(x, a) === a
```
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Hi there,
I was wondering if I'm overlooking something: is the `` operation of an edge for a Labelled Graph ever used? Or is it only used for it's `mempty` value to "recover" `Overlay`? In which ca…
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#86 was jumping the gun: https://mail.haskell.org/pipermail/libraries/2020-April/030357.html
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I wanted to implement this idea in bigop.v but never had time for that. So, I'm briefly writing my idea here.
Many lemmas about `\big[op/idx]` require `idx` to be the identity element w.r.t. `op`. …
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Trying to write this interface:
interface Semiring a (zero : a) (one : a) (add : Monoid a zero p) (mul : Monoid a one m) where
gives me a "no such variable `a`" error, but changing it to
…