The invention and use of mathematical symbols are later than numbers, but their number exceeds numbers. There are more than 200 mathematical symbols commonly used in modern mathematics, and each symbol has an interesting experience.
159 1 year, the French mathematician Veda used this symbol in a large number of diamonds, and it was gradually accepted by people. /kloc-In the 7th century, Leibniz in Germany widely used the symbol "=", and he also used "∽" to indicate similarity and ""to indicate congruence in geometry.
Greater than sign ">" and less than sign "
Any number (full name quantifier)? Derived from the English word Arbitrary, because lowercase and uppercase are easily confused, the first letter of the word is capitalized and then inverted. Similarly, existential number (existential quantifier)? Reverse writing of e from the word Exist.
Quantitative symbol
For example, pi (π, 3. 14 159265358979), natural rate (e, 2.7 1828), Fibonacci golden section (φ, 0.6 18033), imaginary number (.
Operation symbol
Such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (∩ ~), logarithm (log, lg, ln,
Natural symbol
Such as plus sign, minus sign, plus sign (and the corresponding minus sign? ) )。