The first sign of syphilis is a small sore, called a chancre (SHANG-kur). The sore appears at the spot where the bacteria entered your body. While most people infected with syphilis develop only one chancre, some people develop several of them. The chancre usually develops about three weeks after exposure.
The colon is the symbol :. It is used in a number of different ways in mathematics. 1. To denote ratio or odds, as in 2:1 (voiced two to one). 2. To mean such that in constructions such as (voiced the set of numbers such that ). 3. To give a name to a map, e.g., (which is equivalent to the function notation ).
In mathematics, a function is defined as a relationship between defined values and one or more variables. For example, a simple math function may be: y = 2x. In this example, the relationship of y to x is that y is twice as much as the value assigned to x. While math functions can be far more complex than this, most are simple relative to functions used in computer programming. This may be why math functions are often referred to as expressions, while computer functions are often called procedures or subroutines. Computer functions are similar to math functions in that they may reference parameters, which are passed, or input into the function. If the example above were written as a computer function, x would be the input parameter and y would be the resulting output value. It might look something like this: function double(x) { $y = 2 * x; return $y;}