| Name | Args | Formula or meaning | Argument Constraints | Result constraints | 
| abs | x | absolute value of x |  |  | 
| acos | x | arc cosine of x in radians | -1.0 ≤ x ≤ 1.0 | 0 ≤ acos(x) ≤ π | 
| asin | x | arc sine of x in radians | -1.0 ≤ x ≤ 1.0 | 0 ≤ asin(x) ≤ π | 
| atan | x | arc tangent of x in radians |  | 0 ≤ atan(x) ≤ π | 
| ceil | x | smallest number not less than x whose value is an exact integer |  |  | 
| cos | x | cosine of x |  |  | 
| exp | x | e x, where e is the base of the natural logarithm |  |  | 
| floor | x | largest number not greater than x whose value is an exact integer |  |  | 
| log | x | natural logarithm of x | x > 0 |  | 
| log10 | x | base 10 logarithm of x | x > 0 |  | 
| pow | x, y | x y |  |  | 
| sqr | x | x2 |  |  | 
| sqrt | x | √x | x > 0 | sqrt(x) ≥ 0 | 
| sin | x | sine of x |  |  | 
| tan | x | tangent of x | x ≠ n*π/2, for odd integer n |  | 
The names of mathematical functions defined in the SBML
Level 1 Version 2 text-string formula syntax.