Name Meaning MathML
true The boolean value true <true/>
false The boolean value false <false/>
pi The mathematical constant pi <pi/>
avogadro The numerical value of Avogadro's constant, as defined in the SBML specification <csymbol encoding="text" definitionURL="http://www.sbml.org/sbml/symbols/avogadro"> avogadro </csymbol/>
time Simulation time as defined in SBML <csymbol encoding="text" definitionURL="http://www.sbml.org/sbml/symbols/time"> time </csymbol/>
inf or infinity The mathematical constant "infinity" <infinity/>
nan or notanumber The mathematical concept "not a number" <notanumber/>
Mathematical symbols defined in the "Level 3" text-string formula syntax.