Tuber magnatum pound ($2200–$4800 per kg); as of December 2009 they were being sold at $14,203.50 per kilogram. In November 1999, what was then the largest truffle in the world was found near Buje, Croatia. The truffle weighed and was entered in the "Guinness Book of Records". The record price paid for a single white truffle was set in December 2007, when Macau casino owner Stanley Ho paid $330,000 (£165,000) for a specimen weighing . One of the largest truffles found in decades, it was unearthed near Pisa, Italy, and sold at an auction held simultaneously in Macau, Hong Kong, and Florence.
Weighing matrix values of "n" and "w" does there exist a "W"("n","w")? A great deal about this is unknown. An equally important but often overlooked question about weighing matrices is their enumeration: for a given "n" and "w", how many "W"("n","w")'s are there? This question has two different meanings. Enumerating up to equivalence and enumerating different matrices with same n,k parametets. Some papers were published on the first question but none were published on the second important question. Weighing matrix In mathematics, a weighing matrix "W" of order "n" and weight "w" is an "n" × "n" (0,1,-1)-matrix such that formula_1, where