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_WHITESPACE = " " | "\t" | " ";
_ = {_WHITESPACE};
DIGIT = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9";
ADD = _, ("+"), _;
SUB = _, ("-" | "−"), _;
MUL = _, ("*" | "⋅" | "×"), _;
DIV = _, ("/" | "∕" | "÷"), _;
sign = ADD | SUB;
unsigned = DIGIT, {DIGIT | _WHITESPACE | "_" | "'"};
_number = unsigned | "(", _expr, (")" | -);
number = _number, {_, _number}; (* optionally with implicit multiplication *)
value = [sign], number;
_expr = hyper1;
hyper1 = _, hyper2, {(ADD | SUB), (hyper2 | -)}, _;
hyper2 = _, value, {(MUL | DIV), (value | -)}, _;
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