nostr:npub1w7zvr7zkkaztcpznfd46xx42nf2vkxftqnlm2nlwnrk4f454fpjs4due4q nostr:npub1pt6l3a97fvywrxdlr7j0q8j2klwntng35c40cuhj2xmsxmz696uqfr6mf6 they are more like empty subsets of R (actually IEEE 754 double-precision floats)