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- Article
Refined Configuration Results for Extremal Type II Lattices of Ranks 40 and 80
By: Noam D. Elkies and Scott Duke Kominers
We show that, if L is an extremal Type II lattice of rank 40 or 80, then L is generated by its vectors of norm min(L)+2. This sharpens earlier results of Ozeki, and the second author and Abel, which showed that such lattices L are generated by their vectors of norms... View Details
Keywords: Mathematical Methods
- December 2009 (Revised April 2022)
- Case
Lyondell Chemical Company
By: Stuart C. Gilson and Sarah Abbott
Hit with an industry recession and the global financial crisis of 2008, in January 2009 LyondellBasell Industries AF S.C.A., one of the world's largest internationally diversified chemical companies headquartered in The Netherlands, placed its U.S. operations and a... View Details
- September 2009 (Revised November 2010)
- Case
Endeavor: Creating a Global Movement for High-Impact Entrepreneurship
This case describes a critical inflection point in the growth of an international development "mentor capitalist" nonprofit, Endeavor. As Endeavor aims to scale its high-impact entrepreneurship model globally, founder Linda Rottenberg must determine what success looks... View Details
- September – October 2009
- Article
U.S. Energy Policy: Overcoming Barriers to Acting
By: Max Bazerman
Energy policy is on everyone's mind these days. The U.S. presidential campaign focused on energy independence and exploration (drill, baby, drill), climate change, alternative fuels, even nuclear energy. But there is a serious problem endemic to America's energy... View Details
- May 2009
- Article
Configurations of Extremal Even Unimodular Lattices
We extend the results of Ozeki on the configurations of extremal even unimodular lattices. Specifically, we show that if L is such a lattice of rank 56, 72, or 96, then L is generated by its minimal-norm vectors. View Details
Keywords: Mathematical Methods
- January 2009 (Revised June 2024)
- Case
Design Thinking and Innovation at Apple
By: Stefan Thomke and Barbara Feinberg
Describes Apple's approach to innovation, management, and design thinking. For several years, Apple has been ranked as the most innovative company in the world, but how it has achieved such success remains mysterious because of the company's obsession with secrecy.... View Details
- Article
Configurations of Rank-40r Extremal Even Unimodular Lattices (r=1,2,3)
By: Scott Duke Kominers and Zachary Abel
We show that if L is an extremal even unimodular lattice of rank 40r with r=1,2,3 then L is generated by its vectors of norms 4r and 4r+2. Our result is an extension of Ozeki's result for the case r=1. View Details
Keywords: Mathematical Methods
- December 2008
- Teaching Note
LinkedIn Corp., 2008 (TN)
By: David B. Yoffie
Teaching Note for [709426]. View Details
- December 2008 (Revised April 2009)
- Background Note
China's Energy Industry
By: F. Warren McFarlan, George Baroutas and Tracy Manty
China is ranked the world's second largest consumer of energy. This note provides background on China's energy industry and provides details on China's leading state-owned energy companies, production and consumption statistics, and government policies in support of... View Details
- October 2008
- Article
Creativity and the Role of the Leader
By: Teresa M. Amabile and Mukti Khaire
In today's innovation-driven economy, understanding how to generate great ideas has become an urgent managerial priority. Suddenly, the spotlight has turned on the academics who've studied creativity for decades. How relevant is their research to the practical... View Details
- October 2008 (Revised January 2011)
- Case
Lawrence Trinh: Venturing to Vietnam
By: Joshua D. Margolis and Rachel Gordon
Should Lawrence Trinh pursue his aspiration of working in Vietnam—and if so, what set of principles and practices should he adopt if he encounters corruption? These are questions that reverberate for many students who wish to work in emerging markets and other contexts... View Details
- August 2008
- Case
Sloan & Harrison: Non-Equity Partner Discontent
By: Boris Groysberg and Eliot Sherman
The law firm, Sloan & Harrison, was dealing with some discontent among its junior non-equity partners. These partners were concerned with the transparency of the advancement process, their ability to position themselves as both leaders within the firm and rainmakers,... View Details
- May 2008
- Case
Thomas Green: Power, Office Politics and a Career in Crisis
By: W. Earl Sasser Jr. and Heather Beckham
The case describes the dilemma of a marketing manager, Thomas Green, who, after being rapidly promoted, is harshly criticized by his boss, Frank Davis. Green and Davis disagree on work styles and market projections. Green believes the sales goals set by Davis are based... View Details
- May 2008
- Teaching Note
Thomas Green: Power, Office Politics, and a Career in Crisis (Brief Case)
By: W. Earl Sasser Jr. and Heather Beckham
Teaching Note for 2095. View Details
- March 2008 (Revised October 2009)
- Case
Crossing Borders: MTC's Journey through Africa
By: Tarun Khanna and Ayesha Khan
This is the story of MTC, a Kuwaiti telecom company that has grown from a sleepy, state monopoly to become one of the fastest growing telecom companies in the world, with the largest regional footprint across the Middle East and Africa. The CEO of the company, Dr. Saad... View Details
- February 2008 (Revised September 2010)
- Case
LeapFrog Enterprises
By: Lynda M. Applegate and Elizabeth Collins
Explores the success factors leading to the company's rise to the number three ranking in the aggressively competitive toy industry. LeapFrog has made the strategic decision to expand beyond the toy industry and enter the educational technology and services industry.... View Details
- 2008
- Working Paper
The Strength of Peripheral Ties: Maintaining Status When Firms Lose Resources
By: Mikolaj J. Piskorski and Bharat N. Anand
This paper examines conditions under which high-status firms can retain their positions, even if they lose resources. Firms are considered high status when they obtain ties from other high-status firms. Among high-status firms, we distinguish between those that also... View Details
- November 2007
- Case
The 1995 Release of the Institutional Investor Research Report: The Impact of New Information
By: Boris Groysberg, Nitin Nohria and Derek Haas
In 1995, Institutional Investor magazine began selling a complete ranking of the best equity research analysts. This report allowed research firms to assess the relative quality of each analyst across the industry, and this enabled firms to know nearly as much about... View Details
- November 2007
- Supplement
Differences at Work: Allie (B)
By: Sandra J. Sucher and Rachel Gordon
In Differences at Work: Allie (B) HBS Case No. 9-408-055 Allie and her colleague initially refuse to go but when her boss makes a scene they reluctantly agree to accompany him to the beach despite his inappropriate behavior. Later back at company headquarters they tell... View Details