{0 Lambda calculus} This representation is the fifth in the compilation chain (see {{: index.html#architecture} Architecture}). Its main difference with the previous {{: Dcalc.html} default calculus} is the absence of the default term, which has been eliminated through diverse compilation schemes. The module describing the abstract syntax tree is: {!modules: Lcalc.Ast} This intermediate representation corresponds to the lambda calculus presented in the {{: https://arxiv.org/abs/2103.03198} Catala formalization}. {1 Compilation from default calculus } Related modules: {!modules: Lcalc.Compile_with_exceptions} {!module: Lcalc.Compile_with_exceptions} compiles the default term of the default calculus using catchable exceptions. This compilation scheme has been certified. {1 Backends} Related modules: {!modules: Lcalc.To_ocaml Lcalc.To_python Lcalc.Backends} The OCaml backend of the lambda calculus is merely a syntactic formatting, since the core of the OCaml value language is effectively a lambda calculus.