Euclid preparation. X. The Euclid photometric-redshift challenge

Euclid Collaboration and Desprez, G. and Paltani, S. and Coupon, J. and Almosallam, I. and Alvarez-Ayllon, A. and Amaro, V. and Brescia, M. and Brodwin, M. and Cavuoti, S. and De Vicente-Albendea, J. and Fotopoulou, S. and Hatfield, P. W. and Hartley, W. G. and Ilbert, O. and Jarvis, M. J. and Longo, G. and Rau, M. M. and Saha, R. and Speagle, J. S. and Tramacere, A. and Castellano, M. and Dubath, F. and Galametz, A. and Kuemmel, M. and Laigle, C. and Merlin, E. and Mohr, J. J. and Pilo, S. and Salvato, M. and Andreon, S. and Auricchio, N. and Baccigalupi, C. and Balaguera-Antolínez, A. and Baldi, M. and Bardelli, S. and Bender, R. and Biviano, A. and Bodendorf, C. and Bonino, D. and Bozzo, E. and Branchini, E. and Brinchmann, J. and Burigana, C. and Cabanac, R. and Camera, S. and Capobianco, V. and Cappi, A. and Carbone, C. and Carretero, J. and Carvalho, C. S. and Casas, R. and Casas, S. and Castander, F. J. and Castignani, G. and Cimatti, A. and Cledassou, R. and Colodro-Conde, C. and Congedo, G. and Conselice, C. J. and Conversi, L. and Copin, Y. and Corcione, L. and Courtois, H. M. and Cuby, J. -G. and Da Silva, A. and de la Torre, S. and Degaudenzi, H. and Di Ferdinando, D. and Douspis, M. and Duncan, C. A. J. and Dupac, X. and Ealet, A. and Fabbian, G. and Fabricius, M. and Farrens, S. and Ferreira, P. G. and Finelli, F. and Fosalba, P. and Fourmanoit, N. and Frailis, M. and Franceschi, E. and Fumana, M. and Galeotta, S. and Garilli, B. and Gillard, W. and Gillis, B. and Giocoli, C. and Gozaliasl, G. and Graciá-Carpio, J. and Grupp, F. and Guzzo, L. and Hailey, M. and Haugan, S. V. H. and Holmes, W. and Hormuth, F. and Humphrey, A. and Jahnke, K. and Keihanen, E. and Kermiche, S. and Kilbinger, M. and Kirkpatrick, C. C. and Kitching, T. D. and Kohley, R. and Kubik, B. and Kunz, M. and Kurki-Suonio, H. and Ligori, S. and Lilje, P. B. and Lloro, I. and Maino, D. and Maiorano, E. and Marggraf, O. and Markovic, K. and Martinet, N. and Marulli, F. and Massey, R. and Maturi, M. and Mauri, N. and Maurogordato, S. and Medinaceli, E. and Mei, S. and Meneghetti, M. and Metcalf, R. Benton and Meylan, G. and Moresco, M. and Moscardini, L. and Munari, E. and Niemi, S. and Padilla, C. and Pasian, F. and Patrizii, L. and Pettorino, V. and Pires, S. and Polenta, G. and Poncet, M. and Popa, L. and Potter, D. and Pozzetti, L. and Raison, F. and Renzi, A. and Rhodes, J. and Riccio, G. and Rossetti, E. and Saglia, R. and Sapone, D. and Schneider, P. and Scottez, V. and Secroun, A. and Serrano, S. and Sirignano, C. and Sirri, G. and Stanco, L. and Stern, D. and Sureau, F. and Tallada Crespí, P. and Tavagnacco, D. and Taylor, A. N. and Tenti, M. and Tereno, I. and Toledo-Moreo, R. and Torradeflot, F. and Valenziano, L. and Valiviita, J. and Vassallo, T. and Viel, M. and Wang, Y. and Welikala, N. and Whittaker, L. and Zacchei, A. and Zamorani, G. and Zoubian, J. and Zucca, E.

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