MathOp

A named function or large operator. Symbols grow in display style; names stay upright on the baseline. Scripts read the operator's limit policy.

Property	Default	Meaning
children	Empty	A name, operator glyph, TeX symbol command, or a composed math operand.
symbol	Inferred	Select a Size font for a large operator rather than an upright name.
limits	Operator default	"auto" stacks limits in display style; "always" forces stacking; "never" keeps side scripts. Booleans mean always/never.
center	Symbol/body dependent	Center a glyph operator on the math axis. Named text stays on the baseline.
style / size_index	Inherited	Math style and optional TeX font-size index.
klass / left / right	"mop"	Atom classes exposed to the surrounding row.

Sums and products default to automatic limits. Integrals default to side scripts; limits="always" or TeX \limits overrides that in text and display styles. Use SupSub to attach limits or side scripts.

Operator logical height includes TeX's font metrics; its drawn ink remains independent. This keeps limits clear of a summation sign and scripts near the ends of an integral. See math authoring.