NETMaths

Counterexample bank

Part C is won by knowing which tempting claims are false. 148 counterexamples; 85 free. The rest come with the Notes pack.

#1 · Complex Analysis, Algebra & Topology › Cauchy Theory

Bounded real part ⇒ entire function is constant — fails if only |f| is bounded on a half-plane— false

Counterexample locked — unlock with Notes + PYQ

complexliouville

#2 · Complex Analysis, Algebra & Topology › Cauchy Theory

A bounded holomorphic function on an unbounded domain is constant— false

Counterexample: f(z) = eᶻ on {Re z < 0}

|eᶻ| < 1 there, but f is not constant. Liouville needs the whole plane.

complexliouville

#3 · Complex Analysis, Algebra & Topology › Cauchy Theory

An entire function omitting one value is constant— false

Counterexample locked — unlock with Notes + PYQ

complexliouville