Equation 1 · Part 3 · Fitness Landscapes and the Limits of the Metaphor
Symbol R
What this part means
The real numbers: all values on the continuous number line, including negative and fractional values.
Its job in the formula
R is part of the quantity the equation computes from the expression on the right.
Full expression→Symbol R→Article meaning
The passage around this formula
Take the genotype-space reading, which is the one that empirical work now uses. A genotype is a sequence. The map is . where the sequence has some length and each site takes one of a small number of states. Two genotypes are neighbours when they differ at a single site. This is the object Maynard Smith described as protein space, and his framing remains the cleanest statement of the constraint: evolution must move through the space one step at a time, and every intermediate must itself be viable, in the way that changing WORD to GENE one letter at a time requires each intervening string to be a real word [ 4 ] .
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.