Coins of Armenian king Tigranes the Great clearly reveal a star with a tail on the royal tiara which may be associated with the Halley's passage of 87 BC. Tigranes II the Great (95-55 BC) had made Armenia one of powerful kingdoms in Western Asia, extending from the Caucasus to the eastern Mediterranean. The economical needs and the expansion of the empire resulted in diverse silver and copper-b...

How do concrete objects that cue real-world knowledge affect students’ performance on mathematics word problems? In Experiment 1, fourthand sixth-grade students (N 1⁄4 229) solved word problems involving money. Students in the experimental condition were given bills and coins to help them solve the problems, and students in the control condition were not. Students in the experimental condition ...

Coinage occupies an unusual position in archaeological research. Thriving scholarship on numismatics and monetary history ensures that the objects themselves are well-studied, often seen as an indication of chronology and of stylistic and commercial links. Yet coins might also be analysed as artefacts, and explored as part of the symbolic world of material culture through which archaeologists u...

Given a set of m coins out of a collection of coins of k unknown distinct weights, we wish to decide if all the m given coins have the same weight or not using the minimum possible number of weighings in a regular balance beam. Let m(n, k) denote the maximum possible number of coins for which the above problem can be solved in n weighings. It is known that m(n, 2) = n 1 2 . Here we determine th...

Coins of Armenian king Tigranes the Great clearly reveal a star with a tail on the royal tiara which may be associated with the Halley's passage of 87 BC. Tigranes II the Great (95-55 BC) had made Armenia one of powerful kingdoms in Western Asia, extending from the Caucasus to the eastern Mediterranean. The economical needs and the expansion of the empire resulted in diverse silver and copper-b...

The field of Numismatics provides the names and descriptions of the symbols minted on the ancient coins. Classification of the ancient coins aims at assigning a given coin to its issuer. Various issuers used various symbols for their coins. We propose to use these symbols for a framework that will coarsely classify the ancient coins. Bag of visual words (BoVWs) is a well established visual reco...

In its simplest form, the coin problem is this: what is the largest positive amount of money that cannot be obtained using two coins of specified distinct denominations? For example, using coins of 2 units and 3 units, it is easy so see that every amount greater than or equal to 2 can be obtained, but 1 cannot be obtained. Using coins of 2 units and 5 units, every amount greater than or equal t...

We characterize the tournaments that are dominance graphs of sets of (unfair) coins in which each coin displays its larger side with greater probability. The class of these tournaments coincides with the class of tournaments whose vertices can be numbered in a way that makes them semiacyclic, as defined by Postnikov and Stanley. We provide an example of a tournament on nine vertices that cannot...