Anarithmeticformulaisanexpressioninvolvingonlytheconstant1, and the binary operations of addition and multiplication, withmultiplicationby1notallowed.Weobtainanasymptoticformulaforthenumberofarithmeticformulasevaluatingtonasngoestoinfinity, solving a conjecture of E.K. Gnang and D. Zeilberger. Wegivealsoanasymptoticformulaforthenumberofarithmeticfor-mulas evaluating tonand using exactlykmultiplications. Finallyweanalyzethreespecificencodingsforproducingarithmeticfor-mulas. For almost all integersn, we compare the lengths of thearithmetic formulas fornthat each encoding produces with thelength of the shortest formula forn(which we estimate from be-low).Webrieflydiscussthetime-spacetradeoffofferedbyeach

Counting arithmetic formulas / Gnang, Edinah K.; Radziwill, Maksym; Sanna, Carlo. - In: EUROPEAN JOURNAL OF COMBINATORICS. - ISSN 0195-6698. - STAMPA. - 47:(2015), pp. 40-53. [10.1016/j.ejc.2015.01.007]

Counting arithmetic formulas

Sanna, Carlo
2015

Abstract

Anarithmeticformulaisanexpressioninvolvingonlytheconstant1, and the binary operations of addition and multiplication, withmultiplicationby1notallowed.Weobtainanasymptoticformulaforthenumberofarithmeticformulasevaluatingtonasngoestoinfinity, solving a conjecture of E.K. Gnang and D. Zeilberger. Wegivealsoanasymptoticformulaforthenumberofarithmeticfor-mulas evaluating tonand using exactlykmultiplications. Finallyweanalyzethreespecificencodingsforproducingarithmeticfor-mulas. For almost all integersn, we compare the lengths of thearithmetic formulas fornthat each encoding produces with thelength of the shortest formula forn(which we estimate from be-low).Webrieflydiscussthetime-spacetradeoffofferedbyeach
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2722603