FeynCalc manual (development version)

Expand2

Expand2[exp, x] expands all sums containing x.

Expand2[exp, {x1, x2, ...}] expands all sums containing x1, x2, ....

See also

Overview, ExpandAll2.

Examples

Expand2[(x1 + x2 + x3) (2 x1 + 3 x2) + (y1 + y2 + y3) (2 y1 + 3 y2)]

2 \;\text{x1}^2+5 \;\text{x1} \;\text{x2}+2 \;\text{x1} \;\text{x3}+3 \;\text{x2}^2+3 \;\text{x2} \;\text{x3}+2 \;\text{y1}^2+5 \;\text{y1} \;\text{y2}+2 \;\text{y1} \;\text{y3}+3 \;\text{y2}^2+3 \;\text{y2} \;\text{y3}

Expand2[(x1 + x2 + x3) (2 x1 + 3 x2) + (y1 + y2 + y3) (2 y1 + 3 y2), {y1, y2}]

(2 \;\text{x1}+3 \;\text{x2}) (\text{x1}+\text{x2}+\text{x3})+2 \;\text{y1}^2+5 \;\text{y1} \;\text{y2}+2 \;\text{y1} \;\text{y3}+3 \;\text{y2}^2+3 \;\text{y2} \;\text{y3}

Expand2[(x1 + x2 + x3) (2 x1 + 3 x2) + (y1 + y2 + y3) (2 y1 + 3 y2), {x1, x2}]

2 \;\text{x1}^2+5 \;\text{x1} \;\text{x2}+2 \;\text{x1} \;\text{x3}+3 \;\text{x2}^2+3 \;\text{x2} \;\text{x3}+(2 \;\text{y1}+3 \;\text{y2}) (\text{y1}+\text{y2}+\text{y3})