Amazon.com Inc, which revolutionized reading with its Kindle eReader, is expected to unveil a tablet computer this week that analysts say will seriously challenge Apple’s market dominating iPad, Reuters reports. Amazon on Friday invited media to a press conference to be held in New York on Wednesday, declining to provide further details. But analysts were confident that the world’s largest internet retailer will introduce its long-awaited tablet computer this year to expand in mobile commerce and sell more digital goods and services. “Wednesday is tablet day,” BGC partners analyst Colin Gillis told Reuters…