Solin, K. 2021. Book Review: Juliet Floyd and Felix Mühlhölzer, "Wittgenstein’s Annotations to Hardy’s Course of Pure Mathematics: An Investigation of Wittgenstein’s Non-Extensionalist Understanding of the Real Numbers". Nordic Wittgenstein Review. 10, (Dec. 2021), 157–162. DOI:https://doi.org/10.15845/nwr.v0i0.3613.