Use a rule with an expression more than once

How-to 6 steps, run in order in one session. Every step was executed against the engine and the output below is what it produced.

Step 1

a + x ^ 2 + y ^ 6 /. {x -> 2 + a, a -> 1}

Output

1 + (2 + a)^2 + y^6

Step 2

a + x ^ 2 + y ^ 6 //. {x -> 2 + a, a -> 1}

Output

10 + y^6

Step 3

log[a b c d] /. log[x_ y_] -> log[x] + log[y]

Output

log[a*b*c*d]

Step 4

log[a b c d] //. log[x_ y_] -> log[x] + log[y]

Output

log[a*b*c*d]

Step 5

ReplaceRepeated[x, x -> x + 1, MaxIterations -> 1000]

Output

1000 + x

Step 6

ReplaceList[log[a b c], log[x_ y_] -> log[x] + log[y]]//Column

Output

Column[{}]

Use a rule with an expression more than once

Functions used