Created
March 22, 2020 18:48
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Grammar for a system of ODEs. I cheat a bit with formula by adding the unecessary <formula> <operator> <variable> and <variable> <operator> <formula>, it helps grammatical evolution algorithms find simpler formulas.
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| <expr> ::= dS/dt = <formula>\ndI/dt = <formula>\ndR/dt = <formula> | |
| <formula> ::= <unary><formula> | <formula> <operator> <formula> | <formula> <operator> <variable> | <variable> <operator> <formula> | <variable> | |
| <unary> ::= - | |
| <operator> ::= - | * | |
| <variable> ::= a | b | I | S |
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