id: 06132035
dt: j
an: 2013a.00617
au: Yiu, Paul
ti: Geometry of sum-difference numbers.
so: Coll. Math. J. 43, No. 5, 408-409 (2012).
py: 2012
pu: Mathematical Association of America, Washington, DC
la: EN
cc: G45 F65
ut: sum-difference numbers; Pythagorean triangles; inscribed circles; escribed
    circles; factorization
ci: 
li: doi:10.4169/college.math.j.43.5.408
ab: Summary: We relate the factorization of an integer $N$ in two ways as $N =
    xy = wz$ with $x + y = w - z$ to the inscribed and escribed circles of
    a Pythagorean triangle.
rv: