A triangular number or triangle number counts the objects that can form an equilateral triangle. The formula is ½(n²+n). The early Greeks used pebbles arranged in patterns to learn arithmetic and geometry.
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A triangular number or triangle number counts the objects that can form an equilateral triangle. The formula is ½(n²+n). The early Greeks used pebbles arranged in patterns to learn arithmetic and geometry.
153 is the 17th triangle number.
The alchemical symbols for the classical elements.
In classical thought, the four elements earth, water, air, and fire as proposed by Empedocles frequently occur; Aristotle added a fifth element or quintessence (after "quint" meaning "fifth") called aether.
2701 is the 73rd triangle number.
Spirit or “fire” walking on water.
Water represents the physical. Fire represents the Spirit.
Jesus personifies Spirit in the physical world.
The tetractys, or tetrad, or the tetractys of the decad is an equilateral triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row, which is the geometrical representation of the fourth triangular number. It was both a mathematical idea and metaphysical symbol for the Pythagoreans.
Proposition 1 in Book 1 of Euclid’s Elements. The method of constructing an equilateral triangle from a given straight line segment AB using only a compass and straight edge.
"The laws of nature are but the mathematical thoughts of God." - Euclid