Here is a list of all documented namespace members with links to the namespaces they belong to:

implicit_euler_solver : num_collect::ode::runge_kutta
implicit_gcv_tag : num_collect::regularization
index_type : num_collect::base
inexact_newton_slope_equation_solver_tag : num_collect::ode
inexact_newton_update_equation_solver_tag : num_collect::ode
initial_step_size_calculator_log_tag : num_collect::ode
is_eigen_matrix_v : num_collect
is_eigen_vector_v : num_collect
is_integral_v : num_collect::base::concepts
is_invocable_as_v : num_collect::base::concepts
is_log_tag_element_char() : num_collect::logging::impl
is_real_scalar_v : num_collect::base::concepts
is_signed_v : num_collect::base::concepts
is_sparse_matrix_v : num_collect::base::concepts
isfinite() : num_collect::base
iteration_parameter_default_width : num_collect::logging::iterations::impl
iteration_parameter_formatter_default_precision : num_collect::logging::iterations::impl