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2 Formalized Mathematics

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Representation of the Fibonacci and Lucas Numbers in Terms of Floor and Ceiling

100%

Jastrzębska M.

Formalized Mathematics

2010

tom 18

nr 1

77-80

In the paper we show how to express the Fibonacci numbers and Lucas numbers using the floor and ceiling operations.

On the Lattice of Intervals and Rough Sets

63%

Grabowski A. , Jastrzębska M.

Formalized Mathematics

2009

tom 17

nr 4

237-244

Rough sets, developed by Pawlak [6], are an important tool to describe a situation of incomplete or partially unknown information. One of the algebraic models deals with the pair of the upper and the lower approximation. Although usually the tolerance or the equivalence relation is taken into account when considering a rough set, here we rather concentrate on the model with the pair of two definable sets, hence we are close to the notion of an interval set. In this article, the lattices of rough sets and intervals are formalized. This paper, being essentially the continuation of [3], is also a step towards the formalization of the algebraic theory of rough sets, as in [4] or [9].