Pi Approximation Day is observed to honour mathematics and the characteristics of π. What is Pi? π represents the ratio of a circle's circumference to its diameter.

Ariel Kulik, Hadas Shachnai, Tami Tamir, Approximations for Monotone and Nonmonotone Submodular Maximization with Knapsack Constraints, Mathematics of Operations Research, Vol. 38, No. 4 (November ...

NOBORU KIKUCHI, YOUNG JOON SONG, PENALTY/FINITE-ELEMENT APPROXIMATIONS OF A CLASS OF UNILATERAL PROBLEMS IN LINEAR ELASTICITY, Quarterly of Applied Mathematics, Vol. 39, No. 1 (April 1981), pp. 1-22 ...