English
If h is DiophFn, then h composed with f and g is DiophFn.
Русский
Если h диагофантова функция, то композиция h с f и g диагофантова.
LaTeX
$$$$\mathrm{DiophFn}(f) \Rightarrow \mathrm{DiophFn}(g) \Rightarrow \mathrm{DiophFn}(\lambda v, h(f(v), g(v)))$$$$
Lean4
/-- The constant function is Diophantine. -/
@[scoped term_parser 1000]
public meta def «termD._» : Lean.ParserDescr✝ :=
ParserDescr.node✝ `Dioph.«termD._» 100
(ParserDescr.binary✝ `andthen (ParserDescr.symbol✝ "D.") (ParserDescr.cat✝ `term 100))