Results 121 to 130 of about 219 (161)

Magic N-Cubes Form a Free Monoid

open access: yes
In this paper we prove a conjecture stated in an earlier paper [A-L]. The conjecture states that with respect to a rather natural operation, the set of N-dimensional magic cubes forms a free monoid for every integer N ? 1.
Allan Adler
core  

The Pills problem revisited

open access: yes, 2004
We revisit the pills problem proposed by Knuth and McCarthy. In a bottle there are m large pills and n small pills. The large pill is equivalent to two small pills. Every day a person chooses a pill at random.
Prodinger, Helmut   +1 more
core  

Enumeration of rooted binary perfect phylogenies. [PDF]

open access: yesDiscrete Appl Math
Shiff CE, Rosenberg NA.
europepmc   +1 more source

Analysis of Algorithms for Listing Equivalence Classes of k-ary Strings

open access: yes, 1996
We give efficient algorithms for listing equivalence classes of k-ary strings under reversal and permutation of alphabet symbols. As representative of each equivalence class we choose that string which is lexicographically smallest.
Frank Ruskey   +2 more
core  

Right-Sided Extravalvular Damage: An Overlooked Driver of Risk Model Failure in Low-Flow, Low-Gradient Aortic Stenosis. [PDF]

open access: yesJ Soc Cardiovasc Angiogr Interv
Prakash Y   +12 more
europepmc   +1 more source

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