The Granny Whale
نویسندگان
چکیده
منابع مشابه
The Granny and the Square Tangle and the Unknotting Number
We show that a knot with a diagram with n granny and square tangles has unknotting number at least n, bridge number > n, and braid index > n. As an application, we construct exponentially many in the crossing number slice knots with arbitrarily high unknotting number.
متن کاملGranny gets smarter but Junior hardly notices
To ensure that university computing students are sensitized to the needs of diverse user groups, a course project was designed to allow students to get a realistic understanding of the needs and abilities of the older mobile phone user. Over a three year period different student cohorts interviewed these users to assess their experience with mobile phones. It was found that students were genera...
متن کاملGeneralised Knot Groups Distinguish the Square and Granny Knots
Given a knot K we may construct a group Gn(K) from the fundamental group of K by adjoining an nth root of the meridian that commutes with the corresponding longitude. These “generalised knot groups” were introduced independently by Wada and Kelly, and contain the fundamental group as a subgroup. The square knot SK and the granny knot GK are a well known example of a pair of distinct knots with ...
متن کاملA Two Loop Shoelace Granny Knot In The Coronary Sinus
Images in Electrophysiology A Two Loop Shoelace Granny Knot In The Coronary Sinus Gabriel Vanerio, MD CASMU Arrhythmia Service and British Hospital Montevideo, 2420 Av. Italia, Montevideo 1600, Uruguay. Address for correspondence: Gabriel Vanerio, MD, CASMU Arrhythmia Service and British Hospital Montevideo, 2420 Av. Italia, Montevideo 1600, Uruguay. E-mail: gvanerio/at/yahoo.com
متن کاملThe Whale and the Reactor
PREFACE THE MAP OF the world shows no country called Technopolis, yet in many ways we are already its citizens. Ifone observes how thoroughly our lives are shaped by interconnected systems of modern technology, how strongly we feel their influence, respect their authority and participate in their workings, one begins to understand that, like it or not, we have become members of a new order in h...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scientific American
سال: 1880
ISSN: 0036-8733
DOI: 10.1038/scientificamerican10021880-215