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More generally, we can factor a complex m×n matrix A, with m ≥ n, as the product of an m×m unitary matrix Q and an m×n upper triangular matrix R.As the bottom (m−n) rows of an m×n upper triangular matrix consist entirely of zeroes, it is often useful to partition R, or both R and Q:
The QR code can also be physically printed out. [112] New Brunswick requires a Proof of Vaccination system using original immunisation records. [113] Newfoundland and Labrador has plans to release a QR code based system for their vaccine passport. [114] Nova Scotia has a Proof of Full Vaccination Policy using original government issued proof of ...
The United Nations uses a combination of ISO 3166-1 alpha-2 and alpha-3 codes, along with codes that pre-date the creation of ISO 3166, for international vehicle registration codes, which are codes used to identify the issuing country of a vehicle registration plate; some of these codes are currently indeterminately reserved in ISO 3166-1.
A contactless smart card is a card in which the chip communicates with the card reader through an induction technology similar to that of an RFID (at data rates of 106 to 848 kbit/s). These cards require only close proximity to an antenna to complete a transaction.
A Rolodex file used in the 1970s. A Rolodex is a rotating card file device used to store a contact list.Its name, a portmanteau of the words "rolling" and "index", has become somewhat genericized for any personal organizer performing this function, or as a metonym for a total accumulation of business contacts.
The Qi Card also known for International Smart Card ISC [1] [2] is an Iraqi debit card and is the national credit card of Iraq. It is pronounced as 'key', and it is the reversed form of iq, the ISO 3166 code for Iraq. It has about 3,000 employees, as well as 9 million card users. [3] Its capital is estimated at more than 85 billion Iraqi dinars ...
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