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Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.
The optic equation of the crossed ladders problem can be applied to folding rectangular paper into three equal parts: 1 / 1/2 + 1 / 1 = 1 / h ∴ 2 + 1 = 1 / h ∴ h = 1 / 2 + 1 = 1 / 3 One side (left in the illustration) is partially folded in half and pinched to leave a mark.
A full adder can also be constructed from two half adders by connecting and to the input of one half adder, then taking its sum-output as one of the inputs to the second half adder and as its other input, and finally the carry outputs from the two half-adders are connected to an OR gate.
The Wallace tree is a variant of long multiplication.The first step is to multiply each digit (each bit) of one factor by each digit of the other. Each of these partial products has weight equal to the product of its factors.
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.
The goat problems do not yield any new mathematical insights; rather they are primarily exercises in how to artfully deconstruct problems in order to facilitate solution. Three-dimensional analogues and planar boundary/area problems on other shapes, including the obvious rectangular barn and/or field, have been proposed and solved. [1]