+:plus(positive正的) -:minus(negative负的) *:multiplied by ÷:divided by =:be equal to ≈:be approximately equal to ():round brackets(parenthess) []:square brackets {}:braces ∵:because ∴:therefore ≤:less than or equal to ≥:greater than or equal to ∞:infinity LOGnX:logx to the base n xn:the nth power of x f(x):the function of x dx:diffrencial of x x+y:x plus y (a+b):bracket a plus b bracket closed a=b:a equals b a≠b:a isn't equal to b a>b:a is greater than b a>>b:a is much greater than b a≥b: a is greater than or equal to b x→∞:x approches infinity x2:x square x3:x cube √ ̄x:the square root of x 3√ ̄x:the cube root of x 3‰:three peimill n∑i=1xi:the summation of x where x goes from 1to n n∏i=1xi:the product of x sub i where igoes from 1to n ∫ab:integral betweens a and b |