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Copy file name to clipboardExpand all lines: database/data/003_properties/002_limits-colimits-existence.sql
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TRUE
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),
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(
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'multilimits',
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'multi-limits',
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'has',
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-
'This property refers to the existence of multilimits of small diagrams. Note that any diagram with no cone admits a multilimit, which is the empty set of cones.',
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'This property refers to the existence of multi-limits of small diagrams. Note that any diagram with no cone admits a multi-limit, which is the empty set of cones.',
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'https://ncatlab.org/nlab/show/multilimit',
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'multicolimits',
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'multi-colimits',
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TRUE
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),
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(
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'multicolimits',
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'multi-colimits',
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'has',
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'This property refers to the existence of multicolimits of small diagrams. Note that any diagram with no cocone admits a multicolimit, which is the empty set of cocones.',
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'This property refers to the existence of multi-colimits of small diagrams. Note that any diagram with no cocone admits a multi-colimit, which is the empty set of cocones.',
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'https://ncatlab.org/nlab/show/multilimit',
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'multilimits',
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'multi-limits',
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TRUE
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),
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(
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'multiterminal object',
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'multi-terminal object',
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'has a',
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'This property refers to the existence of a multilimit of the empty diagram. A category has a multiterminal object if and only if each connected component has a terminal object.',
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'This property refers to the existence of a multi-limit of the empty diagram. A category has a multi-terminal object if and only if each connected component has a terminal object.',
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'https://ncatlab.org/nlab/show/multilimit',
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'multiinitial object',
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'multi-initial object',
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TRUE
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),
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(
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'multiinitial object',
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'multi-initial object',
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'has a',
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'This property refers to the existence of a multicolimit of the empty diagram. A category has a multiinitial object if and only if each connected component has a initial object.',
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'This property refers to the existence of a multi-colimit of the empty diagram. A category has a multi-initial object if and only if each connected component has a initial object.',
Copy file name to clipboardExpand all lines: database/data/003_properties/008_locally-presentable.sql
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TRUE
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),
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(
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'multialgebraic',
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'multi-algebraic',
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'is',
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-
'A category is <i>multialgebraic</i> if it is equivalent to the category of models of an FPC-sketch, where FPC represents finite products and small coproducts. This notion was introduced by <a href="https://doi.org/10.1007/BF01224953" target="_blank">Diers</a>.',
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'A category is <i>multi-algebraic</i> if it is equivalent to the category of models of an FPC-sketch, where FPC represents finite products and small coproducts. This notion was introduced by <a href="https://doi.org/10.1007/BF01224953" target="_blank">Diers</a>.',
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NULL,
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NULL,
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TRUE
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),
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(
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'locally multipresentable',
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'locally multi-presentable',
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'is',
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'Let $\kappa$ be a regular cardinal. A category is <i>locally $\kappa$-multipresentable</i> if it is $\kappa$-accessible and has connected limits. It is known that a category is locally $\kappa$-multipresentable if and only if it is equivalent to the category of models of a limit-coproduct sketch; see Thm. 4.32 in <a href="https://ncatlab.org/nlab/show/Locally+Presentable+and+Accessible+Categories" target="_blank">Adamek-Rosicky</a> and the remark below. A category is called <i>locally multipresentable</i> if it is locally $\kappa$-multipresentable for some $\kappa$, equivalently, it is accessible and has connected limits.',
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'Let $\kappa$ be a regular cardinal. A category is <i>locally $\kappa$-multi-presentable</i> if it is $\kappa$-accessible and has connected limits. It is known that a category is locally $\kappa$-multi-presentable if and only if it is equivalent to the category of models of a limit-coproduct sketch; see Thm. 4.32 in <a href="https://ncatlab.org/nlab/show/Locally+Presentable+and+Accessible+Categories" target="_blank">Adamek-Rosicky</a> and the remark below. A category is called <i>locally multi-presentable</i> if it is locally $\kappa$-multi-presentable for some $\kappa$, equivalently, it is accessible and has connected limits.',
Copy file name to clipboardExpand all lines: database/data/004_property-assignments/0.sql
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),
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(
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'0',
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'multialgebraic',
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'multi-algebraic',
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TRUE,
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'The terminal category $\mathbf{1}$ becomes an FPC-sketch by selecting the unique empty cone and cocone. Then, a $\mathbf{Set}$-valued model of this sketch is a functor $\mathbf{1} \to \mathbf{Set}$ sending the unique object to a terminal and initial object, which never exists. Hence, $\mathbf{0}$ is the category of models of this FPC-sketch.'
Copy file name to clipboardExpand all lines: database/data/004_property-assignments/2.sql
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),
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(
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'2',
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'multialgebraic',
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'multi-algebraic',
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TRUE,
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'There is an FPC-sketch whose $\mathbf{Set}$-model is precisely a pair $(X,Y)$ of sets such that the coproduct $X+Y$ is a singleton. Any $\mathbf{Set}$-model of such a sketch is isomorphic to either $(\varnothing, 1)$ or $(1, \varnothing)$, hence the category of models is equivalent to $\mathbf{2}$.'
Copy file name to clipboardExpand all lines: database/data/004_property-assignments/Fld.sql
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),
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(
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'Fld',
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'multialgebraic',
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'multi-algebraic',
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TRUE,
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'See Eg. 4.3(1) in <a href="http://www.tac.mta.ca/tac/volumes/8/n3/8-03abs.html" target="_blank">[AR01]</a>.'
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),
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(
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'Fld',
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'multiterminal object',
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'multi-terminal object',
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FALSE,
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'Every field has a non-trivial extension, for instance, the rational function field over itself in one variable. Hence, a multiterminal object never exists.'
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'Every field has a non-trivial extension, for instance, the rational function field over itself in one variable. Hence, a multi-terminal object never exists.'
Copy file name to clipboardExpand all lines: database/data/004_property-assignments/Setne.sql
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),
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(
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'Setne',
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'multilimits',
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'multi-limits',
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TRUE,
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'Let $D$ be a diagram in $\mathbf{Set}_{\neq \varnothing}$, and let $L$ be a limit of $D$ in $\mathbf{Set}$. If $L$ is non-empty, it gives a limit in $\mathbf{Set}_{\neq \varnothing}$ as well. If $L$ is the empty set, there is no cone over $D$ in $\mathbf{Set}_{\neq \varnothing}$; hence the empty set of cone gives a multilimit of $D$ in $\mathbf{Set}_{\neq \varnothing}$.'
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'Let $D$ be a diagram in $\mathbf{Set}_{\neq \varnothing}$, and let $L$ be a limit of $D$ in $\mathbf{Set}$. If $L$ is non-empty, it gives a limit in $\mathbf{Set}_{\neq \varnothing}$ as well. If $L$ is the empty set, there is no cone over $D$ in $\mathbf{Set}_{\neq \varnothing}$; hence the empty set of cone gives a multi-limit of $D$ in $\mathbf{Set}_{\neq \varnothing}$.'
Copy file name to clipboardExpand all lines: database/data/005_implications/001_limits-colimits-existence-implications.sql
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FALSE
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),
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(
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'multilimits_generalize_limits',
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'multi-limits_generalize_limits',
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'["complete"]',
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'["multilimits"]',
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'Limits are precisely multilimits such that the set of cones is singleton.',
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'["multi-limits"]',
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'Limits are precisely multi-limits such that the set of cones is singleton.',
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FALSE
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),
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(
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'multiterminal_special_case',
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'["multilimits"]',
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'["multiterminal object"]',
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'multi-terminal_special_case',
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'["multi-limits"]',
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'["multi-terminal object"]',
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'This is trivial.',
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FALSE
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),
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(
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'multiterminal_with_connected',
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'["connected","multiterminal object"]',
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'multi-terminal_with_connected',
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'["connected","multi-terminal object"]',
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'["terminal object"]',
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'Let $(T_i)_{i\in I}$ be a multiterminal object in a connected category $\mathcal{C}$. By definition of multiterminal objects, for each object $C$, there are a unique index $i_C\in I$ and a unique morphism $C \to T_{i_C}$. Since the index $i_C$ is invariant under connected components, $I$ must be a singleton. The converse is trivial.',
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'Let $(T_i)_{i\in I}$ be a multi-terminal object in a connected category $\mathcal{C}$. By definition of multi-terminal objects, for each object $C$, there are a unique index $i_C\in I$ and a unique morphism $C \to T_{i_C}$. Since the index $i_C$ is invariant under connected components, $I$ must be a singleton. The converse is trivial.',
'This follows from the fact that a category is locally finitely multipresentable if and only if it is equivalent to the category of models of an FLC-sketch, where FLC represents finite limits and small coproducts.',
'This follows from the fact that a category is locally finitely multi-presentable if and only if it is equivalent to the category of models of an FLC-sketch, where FLC represents finite limits and small coproducts.',
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FALSE
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),
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(
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'varieties_are_multialgebraic',
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'varieties_are_multi-algebraic',
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'["locally strongly finitely presentable"]',
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'["multialgebraic"]',
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'["multi-algebraic"]',
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'This is because that every FP-sketch is an FPC-sketch.',
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