Last Updated：2025/12/07
The relation R ⊆ A × B is right total, since for every b ∈ B there exists an a ∈ A with (a, b) ∈ R.
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The relation R ⊆ A × B is right total, since for every b ∈ B there exists an a ∈ A with (a, b) ∈ R.
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