$\textbf{$T_1$ space / Fréchet space}$
A topological space $X$ is called a $T_1$ space or Fréchet space if for any two points $x\neq y$ there is an open set containing $x$ but not $y$ and another open set containing $y$ but not $x$.
$\textbf{$T_1$ space / Fréchet space}$
A topological space $X$ is called a $T_1$ space or Fréchet space if for any two points $x\neq y$ there is an open set containing $x$ but not $y$ and another open set containing $y$ but not $x$.
copied
𝐓₁ 𝐬𝐩𝐚𝐜𝐞 / 𝐅𝐫𝐞𝐜𝐡𝐞𝐭 𝐬𝐩𝐚𝐜𝐞
A topological space 𝑋 is called a 𝑇₁ space or Fréchet space if for any two points 𝑥≠𝑦 there is an open set containing 𝑥 but not 𝑦 and another open set containing 𝑦 but not 𝑥.