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Tried to formulate the question in what was intended (given the discussion in the comments) and so that the quantors are clear.
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LetFor a continuous function $k:[0,1]^2\to \mathbb{R}$, let $A$ be athe generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifneddefined by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$$$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds, \quad t \in [0,1]. $$ Fix $\mu$ beGiven a finite Borel measure $\mu$ on $C([0,1],\mathbb{R})$ and suppose that we can choosedoes there always exist a $k$ as above such that

For $A$ is injective and for every $\epsilon>0$, can we always findthere exists a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$ we have $B \cap A^n(B)= \emptyset$,
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$$\mu(C([0,1],\mathbb{R})\setminus B)<\epsilon$?
  • $A$ is injective

Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Fix $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$ and suppose that we can choose $k$ such that

For every $\epsilon>0$, can we always find a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$?
  • $A$ is injective

For a continuous function $k:[0,1]^2\to \mathbb{R}$, let $A$ be the generalized Volterra integral operator on $C([0,1],\mathbb{R})$ defined by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds, \quad t \in [0,1]. $$ Given a finite Borel measure $\mu$ on $C([0,1],\mathbb{R})$ does there always exist a $k$ as above such that $A$ is injective and for every $\epsilon>0$, there exists a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • for some $n \in \mathbb{N}$ we have $B \cap A^n(B)= \emptyset$,
  • $\mu(C([0,1],\mathbb{R})\setminus B)<\epsilon$?
I made edits to the question to address concerns of the commentators
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Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Assume that $A$ is injective and letFix $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$. and suppose that we can choose $k$ such that

For every $\epsilon>0$, can we always find a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$?
  • $A$ is injective

Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Assume that $A$ is injective and let $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$.

For every $\epsilon>0$, can we always find a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$?

Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Fix $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$ and suppose that we can choose $k$ such that

For every $\epsilon>0$, can we always find a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$?
  • $A$ is injective
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ABIM
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Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Assume that $A$ is injective and let $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$. Then

For every $\epsilon>0$, can we always find a Borel subset $B\subseteq C([0,1],\mathbb{R})$ of arbitrarily small measure such that $$ B \cap A^n(B)= \emptyset, $$ for some $n \in \mathbb{N}$ depending on $\mu(C([0,1],\mathbb{R})-B)$?

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$?

Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Assume that $A$ is injective and let $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$. Then can we always find a subset $B\subseteq C([0,1],\mathbb{R})$ of arbitrarily small measure such that $$ B \cap A^n(B)= \emptyset, $$ for some $n \in \mathbb{N}$ depending on $\mu(C([0,1],\mathbb{R})-B)$?

Let $A$ be a generalized Volterra integral operator on $C([0,1],\mathbb{R})$ deifned by $$ A(f)(t)\triangleq \int_0^t k(s,t)f(s) ds. $$ Assume that $A$ is injective and let $\mu$ be a finite Borel measure on $C([0,1],\mathbb{R})$.

For every $\epsilon>0$, can we always find a Borel subset $B\subseteq C([0,1],\mathbb{R})$ such that

  • $ B \cap A^n(B)= \emptyset, $ for some $n \in \mathbb{N}$
  • $\mu(C([0,1],\mathbb{R})-B)<\epsilon$?
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