The document discusses several key concepts in company law:
1) The doctrine of ultra vires states that any acts outside a company's object clause are void, though this has been modified by statute.
2) The rule in Foss v Harbottle establishes that the proper plaintiff for wrongs against a company is the company itself, not individual shareholders, unless an exception applies.
3) Exceptions to Foss v Harbottle allow minority shareholders to sue when acts are ultra vires, fraudulent, or where the wrongdoers control the company.