Vertical and top arrows??

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Here in her short note in the middle of the page 1, Emily Riehl says ...with the top two vertical arrows ... I just wonder how vertical arrows can be top or bottom. I would say that vertical arrows may be either left or right and on the contrary horizontal may be top or bottom,right? What does she mean by top two vertical arrows?




category-theory morphism diagram-chasing




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    Isn't this pretty clear by looking at the picture? The diagram in the right hand side consists of two squares above each other. Then the top vertical arrows probably refer to the vertical arrows of the upper square and bottom vertical arrows refers to the vertical arrows of the lower square.
    – Jan Bohr
    2 days ago















up vote
-1
down vote

favorite












Here in her short note in the middle of the page 1, Emily Riehl says ...with the top two vertical arrows ... I just wonder how vertical arrows can be top or bottom. I would say that vertical arrows may be either left or right and on the contrary horizontal may be top or bottom,right? What does she mean by top two vertical arrows?




category-theory morphism diagram-chasing




share|cite|improve this question















  • 3




    Isn't this pretty clear by looking at the picture? The diagram in the right hand side consists of two squares above each other. Then the top vertical arrows probably refer to the vertical arrows of the upper square and bottom vertical arrows refers to the vertical arrows of the lower square.
    – Jan Bohr
    2 days ago













up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











Here in her short note in the middle of the page 1, Emily Riehl says ...with the top two vertical arrows ... I just wonder how vertical arrows can be top or bottom. I would say that vertical arrows may be either left or right and on the contrary horizontal may be top or bottom,right? What does she mean by top two vertical arrows?




category-theory morphism diagram-chasing




share|cite|improve this question











Here in her short note in the middle of the page 1, Emily Riehl says ...with the top two vertical arrows ... I just wonder how vertical arrows can be top or bottom. I would say that vertical arrows may be either left or right and on the contrary horizontal may be top or bottom,right? What does she mean by top two vertical arrows?





category-theory morphism diagram-chasing





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asked 2 days ago









user122424

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  • 3




    Isn't this pretty clear by looking at the picture? The diagram in the right hand side consists of two squares above each other. Then the top vertical arrows probably refer to the vertical arrows of the upper square and bottom vertical arrows refers to the vertical arrows of the lower square.
    – Jan Bohr
    2 days ago













  • 3




    Isn't this pretty clear by looking at the picture? The diagram in the right hand side consists of two squares above each other. Then the top vertical arrows probably refer to the vertical arrows of the upper square and bottom vertical arrows refers to the vertical arrows of the lower square.
    – Jan Bohr
    2 days ago








3




3




Isn't this pretty clear by looking at the picture? The diagram in the right hand side consists of two squares above each other. Then the top vertical arrows probably refer to the vertical arrows of the upper square and bottom vertical arrows refers to the vertical arrows of the lower square.
– Jan Bohr
2 days ago





Isn't this pretty clear by looking at the picture? The diagram in the right hand side consists of two squares above each other. Then the top vertical arrows probably refer to the vertical arrows of the upper square and bottom vertical arrows refers to the vertical arrows of the lower square.
– Jan Bohr
2 days ago











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In the right side picture we have four vertical arrows, two of them are top arrows and the other two are bottom arrows. You also have three horizontal arrows and you may talk about top two or bottom two horizontal arrows.






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    active

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    1 Answer
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    active

    oldest

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    active

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    active

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    up vote
    2
    down vote



    accepted










    In the right side picture we have four vertical arrows, two of them are top arrows and the other two are bottom arrows. You also have three horizontal arrows and you may talk about top two or bottom two horizontal arrows.






    share|cite|improve this answer

























      up vote
      2
      down vote



      accepted










      In the right side picture we have four vertical arrows, two of them are top arrows and the other two are bottom arrows. You also have three horizontal arrows and you may talk about top two or bottom two horizontal arrows.






      share|cite|improve this answer























        up vote
        2
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        accepted







        up vote
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        down vote



        accepted






        In the right side picture we have four vertical arrows, two of them are top arrows and the other two are bottom arrows. You also have three horizontal arrows and you may talk about top two or bottom two horizontal arrows.






        share|cite|improve this answer













        In the right side picture we have four vertical arrows, two of them are top arrows and the other two are bottom arrows. You also have three horizontal arrows and you may talk about top two or bottom two horizontal arrows.







        share|cite|improve this answer













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        answered 2 days ago









        Mohammad Riazi-Kermani

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