It is physically logical to deduce that there is an infinity of direction to choose from. Moreover, for each chosen direction there is an infinity of other direction pointing in the same chosen direction. This idea suggests that physical reality is really made from an infinity of infinity of equally orientable direction comprising the totality of the space-time continuum. Fortunately, out of this double infinity only two possible groups of relatively local directional symmetry can be created. One is the group of inward directions and the other is the group of outward directions. If these are in a dynamic equilibrium then the result is simply perceived physically as the complete manifestation of the space-time continuum. Since this double infinity of directions have equal absolute magnitudes, each value can be set to unity. Consequently, the minimum number is three unique directions in order to form a local group of magnitude difference, mathematically known as the triangular inequality.
There are three distinct definitions. First is the triangular inequality from complex imaginary numbers. If ₁ and ₂ are complex numbers then complex modulus |₁+₂|, |₁|, and |₂| are related by the triangular inequality: |₁+₂| ≤ |₁| + |₂|. Second is the triangle bounded by three points A, B, and C such that the lengths of all three sides are |AB|, |AC|, and |BC| and the three triangular inequalities are |AB| ≤ |AC| + |BC|, |AC| ≤ |AB| + |BC|, and |BC| ≤ |AC| + |AB|. The third is the triangular inequality for three dimensional vector additions. Let || denote the absolute magnitude of vector , || the absolute magnitude of vector , and |+| the absolute magnitude of vector +. The vector triangular inequality is then given by |+| ≤ || + ||. These can be extended to the Cauchy-Schwarz inequality for integrals. If () and () are two real functions then {∫[()()]}² ≤ {∫[()]²}{∫[()]²} if and only if all these integrals exist. This existence is equivalent to their convergent infinite series expansions if and only if their corresponding limits also exist. Together, the generality of these defined inequalities forms the infinity of triangular infinity.


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