Something that has to do with Greek symbols seems to have changed with FriCAS 1.3.6 and TeXmacs. Please see the attached files: TeXmacs session "bug.tm" and the PDF version "bug.pdf".

Any help would be appreciated.

                        Kostas

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Attachment: bug.pdf
Description: Adobe PDF document

<TeXmacs|1.99.13>

<style|generic>

<\body>
  <\session|fricas|default>
    <\output>
      Checking for foreign routines

      FRICAS="/usr/local/lib/fricas/target/amd64-portbld-freebsd12.1"

      
spad-lib="/usr/local/lib/fricas/target/amd64-portbld-freebsd12.1/lib/libspad.so"

      foreign routines found

      openServer result -2

      \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ FriCAS Computer Algebra
      System\ 

      \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Version: FriCAS
      1.3.6

      \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Timestamp: Sat Jul 11 03:10:07
      UTC 2020

      
-----------------------------------------------------------------------------

      \ \ \ Issue )copyright to view copyright notices.

      \ \ \ Issue )summary for a summary of useful system commands.

      \ \ \ Issue )quit to leave FriCAS and return to shell.

      
-----------------------------------------------------------------------------

      \ 

      Value = #\<less\>INTERPRETED-FUNCTION NIL {1002096EBB}\<gtr\>
    </output>

    <\unfolded-io-math>
      (1) -\<gtr\>\ 
    <|unfolded-io-math>
      f<around*|(|x|)>\<longequal\>a*x<rsup|2>
    <|unfolded-io-math>
      \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Type:
      Void
    </unfolded-io-math>

    <\unfolded-io-math>
      (2) -\<gtr\>\ 
    <|unfolded-io-math>
      f<around*|(|y|)>
    <|unfolded-io-math>
      \ \ \ Compiling function f with type Variable(y) -\<gtr\>
      Polynomial(Integer)\ 

      \;

      <with|mode|math|a*y<rsup|2>>

      \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 
\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ Type:
      Polynomial(Integer)
    </unfolded-io-math>

    <\unfolded-io-math>
      (3) -\<gtr\>\ 
    <|unfolded-io-math>
      f<around*|(|\<alpha\>|)>
    <|unfolded-io-math>
      \ \ Line \ \ 1: f(\<alpha\>)

      \ \ \ \ \ \ \ \ \ \ \ .A.BC

      \ \ Error \ A: Missing mate.

      \ \ Error \ B: syntax error at top level

      \ \ Error \ B: Possibly missing a )\ 

      \ \ Error \ C: The character #\\PLUS-MINUS_SIGN is not an FriCAS
      character.

      \ \ \ 4 error(s) parsing\ 

      \;
    </unfolded-io-math>

    <\input-math>
      (3) -\<gtr\>\ 
    <|input-math>
      \;
    </input-math>
  </session>
</body>

<\initial>
  <\collection>
    <associate|page-height|auto>
    <associate|page-medium|paper>
    <associate|page-type|letter>
    <associate|page-width|auto>
  </collection>
</initial>

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