Symbol Expression Meaning Π a1 x a2x ..x an a =1 v i divides j,which means that there is no remainder wheny is divided byi 间 Absolute value of a X x concatenated with y 之 ≈， x is approximately equal toy ⊕ ⊕， Exclusive-OR of x and y for single-bit variables;Bitwise exclusive-OR of x and y for multiple-bit variables J L The largest integer less than or equal tox xEs The elementx is contained in the set S. ←→ A←→(a1,a2,…a The integer A corresponds to the sequence of integers e1,a2....,ak) 中PREY NEXT◆Symbol Expression Meaning a1 x a2 x ... x an | i|j i divides j, which means that there is no remainder when j is divided by i |,| |a| Absolute value of a || x||y x concatenated with y x y x is approximately equal to y x y Exclusive-OR of x and y for single-bit variables; Bitwise exclusive-OR of x and y for multiple-bit variables , x The largest integer less than or equal to x x S The element x is contained in the set S. A (a1,a2, ...,ak) The integer A corresponds to the sequence of integers (a1,a2, ...,ak)