Improper Length & Time Intervals

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Please tell me what is the name of a length which is not a proper one and of a time interval which is not a proper one.
Thanks
 
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They are respectively "coordinate length" and "coordinate time". You can find these in most relativity books.
 
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1effect said:
They are respectively "coordinate length" and "coordinate time". You can find these in most relativity books.
Thanks. Please give me some quotations.
 
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