ד"ר דוד פרייברט

Stupel, M., Fraivert, D., & Jahangiri, J. (2023). Using Technology and Proofs Without Words in Teaching Mathematical Reasoning to Pre-Service and In-Service Geometry Teachers. International Journal for Technology in Mathematics Education, 30(1).‏

Stupel, M., & Fraivert, D. (2023). Three Different Proofs for the Same Task, 16, 31-34

Fraivert, D., & Stupel, M. (2023). Proof Without Words but With Colors. Resonance, 28(4), 665-667.‏

Fraivert, D. (2023). Properties of Harmonic Quadruples That Transform One Into the Other by Perspective Projection Whose Center Lies at a Point on a Circle. Global Journal of Advanced Research on Classical and Modern Geometries 12(2), 304–315.

Stupel, M., & Fraivert, D. (2022). The Arithmetic Average of Altitudes From Vertices of a Parallelogram to a Straight Line: A Sketch and Proof. North American GeoGebra Journal, 10(1), 14-19.‏

Stupel, M., & Fraivert, D. (2022). Identifying the Argumentations and the Mathematical Theorems of a Geometric Task. International Journal for Technology in Mathematics Education, 29(4).‏

Fraivert, D., Stupel, M., & Samson, D. (2022). An Interesting Geometric Conservation Property-A Multiple Solution Task. Learning and Teaching Mathematics, 2022(33), 20-23.‏

Fraivert, D., & Stupel, M. (2022) Necessary and sufficient conditions for orthogonal circles, International Journal of Mathematical Education in Science and Technology, 53:10, 2837-2848.

Fraivert, D., Sigler, A., & Stupel, M. (2020). Necessary and sufficient properties for a cyclic quadrilateral. International Journal of Mathematical Education in Science and Technolog. 51(6), 913-938

Fraivert, D. (2019). Pascal-points quadrilaterals inscribed in a cyclic quadrilateral. The Mathematical Gazette, 103(557), 233-239

Fraivert, D. (2019). New points that belong to the nine-point circle. The Mathematical Gazette, 103(557), 222-232

Fraivert, D. (2019). A set of rectangles inscribed in an orthodiagonal quadrilateral and defined by pascal-points circles. Journal of Geometry and Graphics, 23(1), 5-27

Fraivert, D., & Stupel, M. (2018). Formulas for special segments in a triangle. At Right Angles, 7(2), 72-85

Fraivert, D., & Fraivert, D. (2018). A group over the set of Pascal points on the sides of a convex quadrilateral. 1-12

Fraivert, D. (2018). New applications of method of complex numbers in the geometry of cyclic quadrilaterals. International Journal of Geometry, 7(1), 5-16

Fraivert, D. (2017). Properties of the tangents to a circle that forms Pascal points on the sides of a convex quadrilateral. Forum Geometricorum, 17, 223-243.

Fraivert, D. (2017). Properties of a Pascal points circle in a quadrilateral with perpendicular diagonals. Forum Geometricorum, 17, 509-526

Fraivert, D., Sigler, A., & Stupel, M. (2016). Common properties of trapezoids and convex quadrilaterals. Journal of Mathematical Sciences, 38, 49-71

Fraivert, D. (2016). The theory of an inscribable quadrilateral and a circle that forms pascal points. Journal of Mathematical Sciences: Advances and Applications, 42, 81-107

Fraivert, D. (2016). The theory of a convex quadrilateral and a circle that forms "Pascal Point" – The properties of "Pascal Points" On the sides of a convex quadrilateral. Journal of Mathematical Sciences, 40, 1-34

Fraivert, D. (2016). Discovering new geometric properties by spiral inductive deductive Investigation. Far East Journal of Mathematical Education,16(2), 185-202

Fraivert, D., & Stupel, M. (2015). The properties of straight lines that issue from the point of intersection of the diagonals of a trapezoid, and are perpendicular to its legs. Journal of Progressive Research in Mathematics. 5(4), 618-623

Stupel, M., Fraivert, D., & Oxman, V. (2014). Investigating derivatives by means of combinatorial analysis of the components of the function. International Journal of Mathematical Education in Science and Technology, 45(6), 892-904