In the present paper the completeness and the minimality of the set of the following built-in constants of Backus FP system are proved: Identity, Head, Tail, Append left, Equals, Composition, Constuction, Condition, Constant.
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                    Material Science (Shared)                
                        , 2025, Issue 1, pp. 1–10
        
        
        
            ISSN Online: 0000-0000
        
        
        
            DOI:
                            10.xxxx/example-doi