 Zero in Four Dimensions: Cultural, Historical, Mathematical, and Psychological Perspectives  Prof. Hossein Arsham; University of Baltimore
A critical panoramic view of basic mathematical fallacies surrounding zero, such as dividing by zero, taking the limit, IEEE special floating point, the notion of zero throughout history, when zero is "not there," the origin of infinity and its symbol,
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 Zeroing In on Catalan's Conjecture  Ivars Peterson (MathTrek)
Preda Mihailescu of the Swiss Federal Institute of Technology in Zurich has
proved a theorem that is likely to lead to a solution of Catalan's conjecture, a
venerable problem involving relationships among whole numbers (in 1844, Catalan asserted that,
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 Zeta related functions and proof of Riemann's Hypothesis
Recent studies on Zeta functions and a proposed proof of Riemann's Hypothesis. Theorem of El'Melik; Proof of "Riemann's hypothesis" by above identities; Other Zeta related functions.
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 ZetaTrek  Rohit Gupta
An "online expedition of science and math hobbyists across the world," ZetaTrek mobilizes citizen scientists to promote the history and culture of mathematics, and involves them in research, with particular emphasis on solving the Riemann Hypothesis.
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 Zombie Cat  Diego Fonstad
Zombie Cat shares learning catalysts  those "perfect stories, explanations, or methods to teach complex mathematical and scientific concepts." Insightful math learning catalysts date back to January, 2011, with categories such as "Videos worth watching"
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 Zome Geometry: Handson Learning with Zome Models  George W. Hart
An upcoming book full of things you can make with the Zome System geometry construction set  a handson guide to the geometry of threedimensional space. Contents include: Angles, Polygons, Polyhedra; Icosahedron and Dodecahedron; Platonic Solids; Counting;
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 Zome System  Zometool, Inc.
Available in kits of various sizes, Zometool is a 31zone design tool and educational toy for kids, hobbyists, students, teachers and researchers. Precisionmolded in ABS plastic, Zometool models spatial structures representing hyperspaces of up to 31
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 Zome: Truncated 120cell  PCMI @ Math Forum: SSTP 2007
One of the activities at the 2007 Secondary School Teachers Program in the Park City Mathematics Institute was the construction of a truncated 120cell using Zometool. View both an explanation of the mathematics and photos of the construction.
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 Zoomin Calculus  Susan J. Northridge
Short instructional videos for students in calculus and precalculus. Topics include algebra, unit circle, natural logarithms, exponents, limits, derivatives, applications of differentiation, integrals, and more.
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 Z's Roguelike Stuff  Zeno Rogue
Mathematical games and projects include HyperRogue, a treasurecollecting, goblinkilling adventure set in nonEuclidean space  specifically, a hyperbolic plane of negative curvature filled with elixirs and slime beasts; and Hydra Slayer, which begins
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 Z Systems, Inc.
Developers of data analysis, acquisition, and visualization software. Evaluation copies available for download. Graphing and data analysis software includes Graph++, a graphing application that evaluates equations and mathematical functions graphically.
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 Zuk  Jan Bobrowski
Download an experimental version of a dynamic Mandelbrot/Julia fractal viewer for DOS.
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