# OpenStax_CNX

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• #### First-Order Logic

• ##### Reasoning with inference rules
• Exercises for First-Order Logic

### Lenses

What is a lens?

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

#### Affiliated with (What does "Affiliated with" mean?)

This content is either by members of the organizations listed or about topics related to the organizations listed. Click each link to see a list of all content affiliated with the organization.
• Rice Digital Scholarship

This collection is included in aLens by: Digital Scholarship at Rice University

Click the "Rice Digital Scholarship" link to see all content affiliated with them.

### Recently Viewed

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Inside Collection (Course):

# browser support

Module by: Ian Barland, John Greiner. E-mail the authors

Summary: (Blank Abstract)

## Warning:

The information in this module is outdated. Please see my course for a table of contents.

## browser note:

This page meant to be viewed with a MathML-enabled browser. If you see (∀x. (P(x) → (∃y. (P(y) ∨ φ)))) as a nice version of (forall x . (P(x) -> (exists y . (P(y) v phi)))) you're doing okay; If you further see 𝒜 ⊢ ℬ as a nice version of (scriptA |- scriptB) you're set! If not, see our description of browser support .

At Rice on the CSNet, use mozilla. Preferably, use version 1.1, as currently available on Solaris 8 machines. On frosty.cs, version 1.1 is the default. On other Solaris 8 machines, version 1.1 is not yet the default, but available via /opt1/mozilla-1.1/sunos5/bin/mozilla.

In general, to view TeachLogic web pages, you'll need a browser that supports the following features:

• Cascading Style Sheets (CSS) -- Most recent browsers support CSS sufficiently well.
• MathML -- Some browsers support MathML sufficiently well. However, most (all?) do not fully support Unicode Plane 1 numerical entity references, which includes most mathematical alphanumeric characters.
• Math-oriented fonts

Which browsers support these features? The above links provide more details, but here's a summary of some browsers.

Alternatively, PDF versions of the web pages are also provided via the Base module's index .

## Content actions

PDF | EPUB (?)

### What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

PDF | EPUB (?)

### What is an EPUB file?

EPUB is an electronic book format that can be read on a variety of mobile devices.

For detailed instructions on how to download this content's EPUB to your specific device, click the "(?)" link.

#### Collection to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks

#### Module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

#### Definition of a lens

##### Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

##### What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

##### Who can create a lens?

Any individual member, a community, or a respected organization.

##### What are tags?

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks