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I have seen people showing one slide progressively by pressing Enter. Could anyone tell me how to realize that in Beamer?

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First have a look at the documentation . There you can find the section Overlays – Marco Daniel Aug 30 '11 at 17:47

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beamer provides \pause that provides this functionality. You can add that anywhere in the slide and it will "pause" the output there, produce an additional slide for post-pause display.

Additionally, many commands typical to LaTeX have been modified in beamer to provide a so-called overlay specification. As an example, the following list show each item only on the specified slides:

  \item<1-> First item
  \item<2> Second item
  \item<3> Last item

Here, the overlay specification is contained within < >. Slide 1 will contain only the "First item". Slide 2 will contain "First item" and "Second item". Slide 3 will contain "First item" and "Last item". This example, taken from the front page of the package documentation provides another view on overlay specifications:

  \frametitle{There Is No Largest Prime Number}
  \framesubtitle{The proof uses \textit{reductio ad absurdum}.}
    There is no largest prime number.
      \item<1-| alert@1> Suppose $p$ were the largest prime number.
      \item<2-> Let $q$ be the product of the first $p$ numbers.
      \item<3-> Then $q+1$ is not divisible by any of them.
      \item<1-> Thus $q+1$ is also prime and greater than $p$.\qedhere

The display depends on the theme used. Below is the first slide of the above frame code from two different themes (left: default; right Frankfurt):

Same frame, different themes in beamer

There are many slide overlay specifications possible. Review the package documentation to see the format provided with each command/environment.

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