Public notice requirement for creditor claims: issue notice promptly and publish in English and vernacular media. Section 102 requires issuance of a public notice within seven days of an order under section 100 inviting creditor claims within twenty-one days; the notice must state the admitting order, identify the resolution professional for claim registration, and give the last date for submission. Publication obligations require at least one English and one vernacular newspaper circulation in the debtor's state, affixation at the Adjudicating Authority's premises, and placement on its website.