Here is a list of all concepts with brief descriptions:

[detail level 1234]

NDune	Dune namespace
NConcept	Namespace for concepts
RNumber	The Number concept is satisfied if the type N can act as a scalar in the context of (hierarchically blocked) containers
NStd	Namespace for features backported from new C++ standards
Rthree_way_comparable	The concept std::three_way_comparable specifies that the three way comparison operator <=> on T yield results consistent with the comparison category implied by Cat
Rthree_way_comparable_with	The concept std::three_way_comparable_with specifies that the three way comparison operator <=> on (possibly mixed) T and U operands yield results consistent with the comparison category implied by Cat. Comparing mixed operands yields results equivalent to comparing the operands converted to their common type
Rindirectly_copyable	The std::indirectly_copyable concept specifies the relationship between an indirectly_readable type and a type that is indirectly_writable. The indirectly_writable type must be able to directly copy the object that the indirectly_readable type references
NTypeTree
NConcept
RTreeNode	Model of a node of a typetree
RStaticDegreeInnerTreeNode	Model of an inner node of a typetree with compile time known degree and child access via index_constant
RUniformInnerTreeNode	Model of an inner node of a typetree with uniform nodes accessible via runtime index
RInnerTreeNode	Model of an inner tree node of a typetree (either static degree or uniform)
RLeafTreeNode	Model of a leaf tree node of a typetree