Sume calculabile prin serii de puteri

Sume calculabile prin serii de puteri

Date: 2004
Creator: Anghel, Nicolae
Description: This article investigates an efficient way of evaluating sums and series, based on a result of Abel applied to associated power series.
Contributing Partner: UNT College of Arts and Sciences
Asupra sumelor de puteri asemenea

Asupra sumelor de puteri asemenea

Date: February 2005
Creator: Anghel, Nicolae
Description: Article addressing, from a historical perspective, Newton's sums of like powers of natural numbers.
Contributing Partner: UNT College of Arts and Sciences
An Abstract Index Theorem on Non-Compact Riemannian Manifolds

An Abstract Index Theorem on Non-Compact Riemannian Manifolds

Date: 1993
Creator: Anghel, Nicolae
Description: Article on an abstract index theorem on non-compact Riemannian manifolds.
Contributing Partner: UNT College of Arts and Sciences
O generalizare a problemei piesei de 5 lei a lui Ţiţeica

O generalizare a problemei piesei de 5 lei a lui Ţiţeica

Date: November 2012
Creator: Anghel, Nicolae
Description: The '5 lei coin' problem of Titeica is generalized to circles of arbitrary radii.
Contributing Partner: UNT College of Arts and Sciences
O demonstratie directă a faptului că L1 (X, B, μ) verifică principiul tare al maximului modulului

O demonstratie directă a faptului că L1 (X, B, μ) verifică principiul tare al maximului modulului

Date: 1989
Creator: Anghel, Nicolae
Description: Article proposing a new direct proof of the fact that L^1 verifies the strong maximum principle, i.e., any analytic map from the complex unit disk into L^1, constant in norm, must be constant.
Contributing Partner: UNT College of Arts and Sciences
Generalizarea problemei 0:59

Generalizarea problemei 0:59

Date: 1980
Creator: Anghel, Nicolae
Description: This note extends a certain combinatorics problem of I. Tomescu.
Contributing Partner: UNT College of Arts and Sciences
Legătura dintre sumele Stieltjes şi sumele simetrice elementare

Legătura dintre sumele Stieltjes şi sumele simetrice elementare

Date: February 2012
Creator: Anghel, Nicolae
Description: Article discussing studies of the relationship between the Stieltjes sums and the elementary symmetric sums.
Contributing Partner: UNT College of Arts and Sciences
On the Constructibility with Ruler and Compass of a Minimum Chord in a Parabola

On the Constructibility with Ruler and Compass of a Minimum Chord in a Parabola

Date: 1997
Creator: Anghel, Nicolae
Description: Article on the constructibility with ruler and compass of a minimum chord in a parabola. The author gives a constructive description of all the points inside a parabola admitting a minimum chord of fixed direction.
Contributing Partner: UNT College of Arts and Sciences
On a Family of Iterated Integrals

On a Family of Iterated Integrals

Date: 2013
Creator: Anghel, Nicolae
Description: This article discusses a family of iterated integrals. Abstract: In this note we generalize an iterated integral identity proposed at a Putnam competition in 1941.
Contributing Partner: UNT College of Arts and Sciences
Projecting on polynomial solutions of second order partial differential operators

Projecting on polynomial solutions of second order partial differential operators

Date: June 2007
Creator: Anghel, Nicolae
Description: Article discussing projecting on polynomial solutions of second order partial differential operators.
Contributing Partner: UNT College of Arts and Sciences
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