Starting from a definition of mathematics proficiency and motivated by give opportunity this proficiency to students of elementary and high school this research seeks to show visual proof as a tool to achieve that goal. ...

This volume includes fifteen research papers to celebrate Luiz Carlos Pereira's 60th birthday. Among the authors contributing to the volume we find colleagues, friends - including his PhD advisor - and admirers. Similar ...

The objective of this study is to analyze the validity of working with proofs in the classroom and to present a partial list of proofs of mathematical formulae of the Brazilian secondary/high school curriculum. The adaptation ...

In this report we document and analyze the ways of reasoning and types of proofs employed by high school mathematics teachers to validate conjectures and to justify procedures in order to solve problems, which emerge when ...