• Arithmetical mistake and Clerical mistake - An arithmetical mistake is a mistake in calculation, while a clerical mistake is a mistake of writing or typing error occurring due to accidental slip or omissions or error due to careless mistake or omission - Substituting different lands in place of the lands which have been notified by a statutory Notification under Section 10(1), 10(3) and 10(5) of the Urban Land (Ceiling and Regulation) Act, 1976 cannot and shall not be done by issuing a corrigendum unless the mandatory requirements contained in the aforementioned sections is complied with - A land holder cannot be divested from his land on the plea of clerical or arithmetical mistake liable to be corrected by issuing corrigendum - Urban Land (Ceiling and Regulation) Act, 1976, Section 10. (2016)3 PLRSC 265