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Constants in change. (Unveränderliche in der Veränderung.) (German)
Monoid 36, No. 125, 12-19 (2016).
Classification: G50 H70 E50 N70 I90
1
Summation formulas involving polynomials. (English)
Math. Teach. (Reston) 109, No. 5, 393-397 (2015).
Classification: H20 I30 E50 G90
2
An analysis of error types a found in the proofs of geometric problems ‒ based on a middle school course. (Korean. English summary)
J. Korean Soc. Math. Educ., Ser. A, Math. Educ. 54, No. 1, 83-98 (2015).
Classification: D70 G40 E50
3
Proofs for showing the inequality between arithmetic and geometric mean. (Preuves pour démontrer l’inégalité entre moyennes arithmétice et géométrique.) (French)
Losanges 29, 22-29 (2015).
Classification: H30 E50
4
Three improvements of a geometric inequality. (Drei Verbesserungen einer geometrischen Ungleichung.) (German)
Wurzel 49, No. 11, 244-248 (2015).
Classification: G40 G70 G90
5
Further remarks on a research agenda for WFNMC: research into the nature and characterization of geometric thinking based on students’ solutions of competition problems. (English)
Math. Compet. 28, No. 1, 42-56 (2015).
Classification: D50 E20 D20 B60
6
Geometric view connecting determinants and area. (English)
Consortium 108, 1-2 (2015).
Classification: G70 U70 E50
7
Analysing student work involving geometric concepts. (English)
Math. Teach. (Derby) 245, 33-36 (2015).
Classification: G60 D70 C30
8
Faux triangles. (English)
Math. Teach. (Derby) 241, 35-37 (2014).
Classification: G40 G70 F60
9
Reasoning and sense making with Pythagoras. (English)
Math. Teach. (Reston) 108, No. 3, 176-182 (2014).
Classification: G40 E50
10
Solving optimization problems with dynamic geometry software: the airport problem. (English)
J. Math. Educ. Teach. Coll. 5, No. 2, 17-27 (2014).
Classification: G40 U70 E50
11
A study on secondary school student’s recognition of vision- dependent jump in geometric proofs. (Korean. English summary)
East Asian Math. J. 30, No. 2, 223-248 (2014).
Classification: G40 E50 C30
12
If only Clairaut had dynamic geometric tools. (English)
Math. Teach. Middle Sch. 19, No. 5, 280-287 (2013).
Classification: G43 U73 E53 A30
13
A new geometric inequality in triangles. (Eine neue geometrische Ungleichung im Dreieck.) (German)
Wurzel 47, No. 3-4, 56-59 (2013).
Classification: G40 G70 G90
14
Rotations in the Gaussian number plane. (Drehungen in der Gaußschen Zahlenebene.) (German)
Wurzel 47, No. 3-4, 77-86 (2013).
Classification: F50 G50 G70
15
On the limits of special geometric series. (Zum Grenzwert spezieller geometrischer Reihen.) (German)
MNU, Math. Naturwiss. Unterr. 66, No. 2, 85-88 (2013).
Classification: I30 G90
16
Equal-faced tetrahedra and equal-faced octahedra. (Gleichflächige Tetraeder und gleichflächige Oktaeder.) (German)
IBDG, Inf.bl. Geom. 31, No. 2, 31-36 (2012).
Classification: G40 G80
17
Two faces of mathematics lessons in Korea: conventional lessons and innovative lessons. (English)
ZDM, Int. J. Math. Educ. 44, No. 2, 121-135 (2012).
Classification: D43 D33 G63
18
Another Pythagorean squares dissection. (English)
Math. Sch. (Leicester) 40, No. 2, 22 (2011).
Classification: G40
19
Tennenbaum’s proof of the irrationality of $\sqrt 2$. (English)
Kennedy, Juliette (ed.) et al., Set theory, arithmetic, and foundations of mathematics. Theorems, philosophies. Cambridge: Cambridge University Press; Ithaca, NY: Association of Symbolic Logic (ASL) (ISBN 978-1-107-00804-5/hbk). Lecture Notes in Logic 36, 226-227 (2011).
Classification: F50 G40
20
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