Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 123]

Checks	Static checks for the presence of different operators and functions
CMath	Wrappers for functions from <cmath>
LinearAlgebra	Functionality from linear algebra such as (modified) principal and mixed matrix invariants
MathematicalOperations	Mathematical operations and corresponding differentation rules
RFFGen	Main namespace of the RFFGen library
CMath
ASin	Sine function including first three derivatives (based on sin(double) in <cmath>)
Cos	Cosine function including first three derivatives (based on cos(double) in <cmath>)
Exp	Exponential function including first three derivatives
Exp2	Function including first three derivatives
LN	Natural logarithm including first three derivatives
Log10	Common (base 10) logarithm including first three derivatives
Log2	Base 2 logarithm including first three derivatives
Pow	Power function with rational exponent $k = \frac{dividend}{divisor}$ including first three derivatives
Sin	Sine function including first three derivatives (based on sin(double) in <cmath>)
Tan	Tangent function including first three derivatives
Concepts
CopyConceptCheck	Static check if the requirements of CopyConcept are satisfied
MultiplyWithArithmeticFromLeftConceptCheck	Static check if the requirements of MultiplyWithArithmeticFromLeftConcept are satisfied
SummationConceptCheck	Static check if the requirements of SummationConcept are satisfied
MultiplicationConceptCheck	Static check if the requirements of MultiplicationConcept are satisfied
ArithmeticConceptCheck	Static check if the requirements of ArithmeticConcept are satisfied
MatrixConceptCheck	Static check if the requirements of MatrixConcept are satisfied
VectorConceptCheck	Static check if the requirements of VectorConcept are satisfied
SymmetricMatrixConceptCheck	Static check if the requirements of SymmetricMatrixConcept are satisfied
FunctionConceptCheck	Static check if the requirements of FunctionConcept are satisfied
CopyConcept	Requires copy-constructibility and copy-assignability
MultiplyWithArithmeticFromLeftConcept	Requires that multiplication with double and int can be performed either by in-place multiplication or by multiplication from the left
SummationConcept	Requires that summation can be performed either by in-place summation or free summation
MultiplicationConcept	Requires that multiplication can be performed
ArithmeticConcept	Requirements on input types
MatrixConcept	Requirements for matrices
VectorConcept	Requirements for vectors
SymmetricMatrixConcept	Requirements for symmetric matrices
FunctionConcept	Minimal requirements for functions
LinearAlgebra
DynamicSizeDeterminant	Determinant of dynamic size matrix with first three derivatives
Deviator	Type of the deviator of a matrix $A\in\mathbb{R}^{n,n}$ , i.e. $A - \frac{\mathrm{tr}(A)}{n}I$
SquaredEuclideanNorm	Compute squared matrix norm $\\|A\\|^2 = A\negthinspace : \negthinspace A = \mathrm{tr}(A^TA) = \sum_{i,j} A_{ij}^2.$
NumberOfRows	Specialize this for your matrix class. Number of rows must be provided by a static member variable called value
NumberOfColumns	Specialize this for your matrix class. Number of columns must be provided by a static member variable called value
NumberOfRows< Matrix< T, n, m...>, MatrixConceptCheck >	Specialization for vectors
NumberOfRows< Matrix< T, n, m >, MatrixConceptCheck >	Specialization for matrices
NumberOfRows< Matrix< n, m >, MatrixConceptCheck >	Specialization for matrices
NumberOfRows< Vector< T, n >, MatrixConceptCheck >	Specialization for vectors
NumberOfRows< Vector< n >, MatrixConceptCheck >	Specialization for vectors
NumberOfColumns< Matrix< T, n, m >, MatrixConceptCheck >	Specialization for matrices
NumberOfColumns< Matrix< T, n, m, other...>, MatrixConceptCheck >	Specialization for matrices
NumberOfColumns< Matrix< n, m >, MatrixConceptCheck >	Specialization for matrices
InvariantTraits< Invariant::PRINCIPAL >	Traits class for access of (shifted) principal invariants
InvariantTraits< Invariant::MODIFIED >	Traits class for access of (shifted) modified principal invariants
InvariantTraits< Invariant::MIXED >	Traits class for access of (shifted) mixed invariants
InvariantTraits< Invariant::MODIFIED_MIXED >	Traits class for access of (shifted) modified mixed invariants
SquaredMatrixNorm	Compute squared matrix norm $\\|A\\|^2 = A\negthinspace : \negthinspace A = \mathrm{tr}(A^TA) = \sum_{i,j} A_{ij}^2.$
FirstModifiedMixedInvariant	First modified mixed invariant $\bar\iota_4=\iota_4\iota_3^{-1/3}$
SecondModifiedMixedInvariant	Second modified mixed invariant $\bar\iota_5=\iota_5\iota_3^{-2/3}$
ThirdModifiedMixedInvariant	Third modified mixed invariant $\bar\iota_6=\iota_6\iota_3^{-1/3}$
FirstModifiedPrincipalInvariant	Isochoric (volume-preserving), first modified principal invariant $\bar\iota_1(A)=\iota_1\iota_3^{-1/3}$ , where $\iota_1$ is the first and $\iota_3$ is the third principal invariant
SecondModifiedPrincipalInvariant	Isochoric (volume-preserving), second modified principal invariant $\bar\iota_2(A)=\iota_2\iota_3^{-1/3}$ , where $\iota_2$ is the second and $\iota_3$ is the third principal invariant
SecondPrincipalInvariant	Second principal invariant $\iota_2(A)=\mathrm{tr}(\mathrm{cof}(A))$ for $A\in\mathbb{R}^{n,n}$
ShiftedInvariant	Possibly scaled, shifted invariant , where for the first two (principal,modified) invariants and for the third (principal,modified) and mixed invariants
LeftCauchyGreenStrainTensor	Left Cauchy-Green strain tensor for a symmetric matrix
LinearizedStrainTensor	Linearized strain tensor $\frac{1}{2}\left(F^T+F\right)$
StrainTensor	Strain tensor $\frac{1}{2}\left(F^T+F\right + F^T F)$
MathematicalOperations
Chain	Chain $f\circ g$ of functions and of type F resp. G (F and G must satisfy the requirements of Concepts::FunctionConcept)
Product	Product of functions of type F and G (F and G must satisfy the requirements of Concepts::FunctionConcept)
Scale	Scaling of some function with a double (F must satisfy the requirements of Concepts::FunctionConcept)
Squared	Squared function (F must satisfy the requirements of Concepts::FunctionConcept)
Sum	Sum of functions of type F and G (F and G must satisfy the requirements of Concepts::FunctionConcept)
Constant	Wrap a constant
Identity	Identity mapping
Variable	Independent variable. Can be uniquely identified by its id
Base	Base class for functions satisfying FunctionConcept. Required for enabling the operators in generate.hh
OutOfDomainException	Exception for scalar function arguments that are outside the domain of the function
NonSymmetricMatrixException	Exception for non-symmetric matrices if symmetric matrices are required
Zero	Specialize this struct for your matrix type if a zero matrix cannot be generated via Matrix(0.)
Zero< Matrix, void_t< Checks::TryCallToFill< Matrix > > >	Specialization for the case that a matrix can be set to zero by calling the member function fill(0)