7
votes
1answer
122 views
Reference for “lax monoidal functors” = “monoids under Day convolution”
Suppose $A$ and $C$ two symmetric monoidal categories. Let's say that $A$ is small and $C$ is locally presentable, and let's assume also that the tensor product on $C$ preserves co …
0
votes
0answers
52 views
the category of right comodule of coalgebra is a monoidal category , why?
the category of right comodule of coalgebra is a monoidal category according the following
the associativity constraint is defined as
a_{U,V,W}((u\otimes v)\otimes w)=u_0\otimes …
4
votes
2answers
257 views
K-theory of monoidal categories
I am novice in the algebraic K- theory and don' t know if this is the right place for the following questions. So some people might consider them as basic questions.
Consider an e …
1
vote
2answers
155 views
“Wrong” strictification of symmetric monoidal categories
It is well-known that any symmetric monoidal category is equivalent to a strict symmetric monoidal category. The construction of this strict monoidal category is rather technical a …
11
votes
1answer
488 views
Are Lurie’s operads special SMCs?
In Higher Operads, Higher Categories, Leinster nicely characterizes operads among monoidal categories (as PROs). Roughly speaking, a monoidal category comes from an operad if its s …
5
votes
1answer
269 views
What about schemes built up out of graded rings?
Toen-Vaquié construct a category of schemes relative to some complete cocomplete closed symmetric monoidal category $C$. Affine schemes correspond by definition 1:1 to commutative …
5
votes
1answer
199 views
Unitalization internal to monoidal categories
Let $C$ be a monoidal category, not assumed to be symmetric. Assume that the underlying category of $C$ is nice enough, for example cocomplete, perhaps even presentable. A semigrou …
6
votes
2answers
315 views
Free symmetric monoidal category on a monoidal category
Consider the $2$-categories
$\mathsf{MonCat}$ of monoidal categories, with strong monoidal functors and monoidal transformations,
$\mathsf{SymMonCat}$ of symmetric monoidal categ …
9
votes
2answers
294 views
The symmetric monoidal category of finite sets
It is well-known that the (augmented) simplex category is the universal monoidal category with a monoid object. What about a commutative analogue? Consider the category $\mathsf{Fi …
7
votes
0answers
199 views
Twisted duality in a symmetric monoidal category
I would like to know if the following definition is already known or even well-known. Is there a reference in the literature? Do you know prominent examples?
Definition. Let $\mat …
4
votes
1answer
176 views
Example of a non-closed cocomplete symmetric monoidal category
Background
By a cocomplete symmetric monoidal category $C$ I mean a symmetric monoidal category whose underlying category is cocomplete and such that $- \otimes X : C \to C$ is co …
4
votes
0answers
243 views
Tensor product of quivers
As a special case of a general construction I have constructed "accidentally" a tensor product of quivers aka directed multigraphs (aka directed graphs for category theorists). Pro …
1
vote
2answers
287 views
Not-so-symmetric monoidal categories
Is the notion of a commutative monoidal category, where every product is isomorphic to its opposite, but not necessarily functorially, known not to be useful? I have not been able …
6
votes
1answer
340 views
Two questions about commutative theories
Let $\mathcal{T}$ be a commutative algebraic theory (for example sets, abelian groups, commutative monoids, but not groups etc.). References include the nlab and Borceux' Handbook …
1
vote
1answer
137 views
Seems like Reader monad composed with a strong monad produces a monad, am I right?
Take a Cartesian (or monoidal) closed category; define Reader monad for a given object $E$ as
$X \mapsto X^E$; and take a strong monad $M$ (strong means preserves product or tensor …

