Results 51 to 60 of about 1,177 (152)
Predictors of reduced length of stay in minimally invasive colectomy, a 20‐year study
Surgical Practice, EarlyView.Abstract Purpose Minimally invasive colorectal resection is a common surgical procedure indicated for a variety of malignant and benign conditions. Length of stay (los) is an important metric in the evaluation of surgical care quality and healthcare expenditure.
Elisa Tran +4 more
wiley +1 more source
A fast metaheuristic approach for the planar multiple obnoxious facility location problem
International Transactions in Operational Research, EarlyView.Abstract The multiple obnoxious facility location problem is one of the most studied problems in the literature of the obnoxious facility location problems family. In this work, we propose an alternative algorithmic approach for this problem, based on an efficient metaheuristic procedure over a discretization of the plane based on Voronoi diagrams ...
Sergio Salazar +2 more
wiley +1 more source
On unitary Zumkeller numbers [PDF]
Notes on Number Theory and Discrete MathematicsIt is well known that if n is a Zumkeller number, then the positive divisors of n can be partitioned into two disjoint subsets of equal sum. Similarly for unitary Zumkeller number n, the unitary divisors of n can be partitioned into two disjoint subsets ...
Bhabesh Das
doaj +1 more source
On the explicit geometry of a certain blowing-up of a smooth quadric
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2023 Using the high symmetry in the geometry of a smooth projective quadric, we construct effectively new families of smooth projective rational surfaces whose nef divisors are regular, and whose effective monoids are finitely generated by smooth projective ...
De La Rosa-Navarro B. L. +4 more
doaj +1 more source
Journal of Systematics and Evolution, EarlyView.We used a molecular approach to resolve the evolutionary lineages of Neotropical Triplophyllum, uncovering that current species circumscriptions are hindered by high morphological homoplasy in indument characters. Our results support the recognition of three new species and provide a necessary neotypification for T.
Mauricio Gonçalves Nunes +6 more
wiley +1 more source
New Proof That the Sum of the Reciprocals of Primes Diverges
Mathematics, 2020 In this paper, we give a new proof of the divergence of the sum of the reciprocals of primes using the number of distinct prime divisors of positive integer n, and the placement of lattice points on a hyperbola given by n=pr with prime number p.
Vicente Jara-Vera +1 more
doaj +1 more source
On Short‐Term Behavior of Implied Volatility for Index Options
Mathematical Finance, EarlyView.ABSTRACT This paper investigates short‐term behavior of implied volatility of derivatives written on a market index when the index is constructed using a ranking procedure. Even when stock prices follow geometric Brownian motion dynamics, the ranking mechanism can lead to the observed term structure of at‐the‐money (ATM) implied volatility skew for ...
Huy N. Chau, Duy Nguyen, Thai Nguyen
wiley +1 more source
Arithmetic functions associated with infinitary divisors of an integer
International Journal of Mathematics and Mathematical Sciences, 1993 The infinitary divisors of a natural number n are the products of its divisors of the form pyα2α, where py is a prime-power component of n and ∑αyα2α (where yα=0 or 1) is the binary representation of y.
Graeme L. Cohen, Peter Hagis
doaj +1 more source
Narrow Windows: Estimating the Household‐Level Opportunity for Roth Conversions
FINANCIAL PLANNING REVIEW, Volume 9, Issue 4, December 2026.ABSTRACT Roth conversions are frequently recommended for near‐retirees, but few households meet the structural conditions that make conversion worthwhile. Using the Survey of Consumer Finances (SCF), this study applies sequential screens—age 55–72, pre‐tax balances ≥$250k$$ \ge \$250\mathrm{k} $$, income headroom, nonaccount liquidity, and ...
Christopher G. Reddick
wiley +1 more source
Oat–Sesbania Rotation Boosts Oat Yield and Profit via Soil Nutrient Buildup and Dual Harvest
Modern Agriculture, Volume 4, Issue 2, December 2026.Under the oat–Sesbania rotation system, soil nutrient accumulation serves as a key driver of increased oat yield and quality, with benefits tending to intensify over successive rotational years. Green manure incorporation of Sesbania promotes soil and crop improvement, whereas forage harvesting of Sesbania attains comparable agronomic outcomes while ...
Yongjie Zhang +12 more
wiley +1 more source