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I'm brand new to SageMath and having trouble getting my bearings. Can you help with these things:

• I downloaded and installed sage-9.1-OSX_10.11.6-X86_64.app.dmg from MIT's mirror (mirrors.mit.edu/sage/osx/intel/index.html -- sorry, my Karma's too low to publish active links.) But although the app starts the way the page says, "like most other Mac applications," the interface is quite different from most other Mac applications. Instead of the usual sequence, "<app name="">, File, Edit, View, ... Window, Help," Sage has "Sage, File, Server, Terminal Session, Development, Help." I recognize "Sage," "File," and "Help," but not the rest. Is there introductory documentation or a tutorial somewhere that explains how to use Sage from this interface?
• Regarding the installation itself, the Components documentation at www.sagemath.org/links-components.html lists 84 separate components. Some of these, like R and Python, I already have installed and use regularly in different contexts. Does SageMath install duplicates, or does it use the already installed versions? And in either case, how does SageMath handle component updates and possible incompatibilities associated with them?
• I want to use SageMath with LyX (www.lyx.org/) and therefore need SageTeX. doc.sagemath.org/html/en/tutorial/sagetex.html#sec-sagetex-install says SageMath comes with SageTex, and all one needs to do is to make TeX aware of it. But the page refers to SAGE_ROOT, and since I installed using the .dmg file, I'm not really sure where SAGE_ROOT is. How does one find it?

I'm brand new to SageMath and having trouble getting my bearings. Can you help with these things:

• I downloaded and installed sage-9.1-OSX_10.11.6-X86_64.app.dmg from MIT's mirror (mirrors.mit.edu/sage/osx/intel/index.html -- sorry, my Karma's too low to publish active links.) But although the app starts the way the page says, "like most other Mac applications," the interface is quite different from most other Mac applications. Instead of the usual sequence, "<app name="">, File, Edit, View, ... Window, Help," Sage has "Sage, File, Server, Terminal Session, Development, Help." I recognize "Sage," "File," and "Help," but not the rest. Is there introductory documentation or a tutorial somewhere that explains how to use Sage from this interface?
• Regarding the installation itself, the Components documentation at www.sagemath.org/links-components.html lists 84 separate components. Some of these, like R and Python, I already have installed and use regularly in different contexts. Does SageMath install duplicates, or does it use the already installed versions? And in either case, how does SageMath handle component updates and possible incompatibilities associated with them?
• I want to use SageMath with LyX (www.lyx.org/) and therefore need SageTeX. doc.sagemath.org/html/en/tutorial/sagetex.html#sec-sagetex-install says SageMath comes with SageTex, and all one needs to do is to make TeX aware of it. But the page refers to SAGE_ROOT, and since I installed using the .dmg file, I'm not really sure where SAGE_ROOT is. How does one find it?

I'm brand new to SageMath and having trouble getting my bearings. bearings. Can you help with these things:

• On macOS 10.14.6, I downloaded and installed sage-9.1-OSX_10.11.6-X86_64.app.dmg installed sage-9.1-OSX_10.11.6-X86_64.app.dmg from MIT's the SageMath download mirror (mirrors.mit.edu/sage/osx/intel/index.html -- sorry, my Karma's too low to publish active links.) at MIT. But although the app starts the way the page says, "like most other other Mac applications," the interface is quite different from most other other Mac applications. Instead of the usual sequence, "<app name="">, File, Edit, View, sequence, "AppName, File, Edit, View, ... Window, Help," Window, Help," Sage has "Sage, File, Server, "Sage, File, Server, Terminal Session, Development, Help." Session, Development, Help." I recognize "Sage," "File," and "Help," "Sage," "File," and "Help," but not the rest. rest. Is there introductory documentation or a tutorial somewhere somewhere that explains how to use Sage from this interface?

• Regarding the installation itself, the Components documentation at www.sagemath.org/links-components.html the SageMath components documentation lists 84 separate components. Some of these, like R and Python, Python, I already have installed and use regularly in different contexts. contexts. Does SageMath install duplicates, or does it use the already installed installed versions? And in either case, how does SageMath handle component component updates and possible incompatibilities associated with them?

• I want to use SageMath with LyX (www.lyx.org/) LyX and therefore need SageTeX. doc.sagemath.org/html/en/tutorial/sagetex.html#sec-sagetex-install In the SageMath documentation, the SageTeX tutorial says SageMath comes with SageTex, SageTeX, and all one needs to do do is to make TeX aware of it. But the page refers to SAGE_ROOT, SAGE_ROOT, and since I installed using the .dmg .dmg file, I'm not really sure sure where SAGE_ROOT SAGE_ROOT is. How does one find it?