====== Together ======
----
====Description====
  * ''Together'' puts terms in a sum over a common denominator

  * ''Together'' cancels only terms that can be canceled without factorisation

  * ''TogetherFactor'' cancels factors in the result


====Examples==== 
Combine terms over a common denominator:
<sxh groovy; gutter: false>
println Together >> 'f_m / a + g_m / b'.t
</sxh>
<sxh plain; gutter: false>
   > (b*f_m + a*g_m)/(a*b)
</sxh>
----
''Together'' automatically takes care about dummy indices relabelling
<sxh groovy; gutter: false>
println Together >> '(f_m*f^m) / (a_n*a^n) + (b_n*b^n) / (c_m*c^m)'.t
</sxh>
<sxh plain; gutter: false>
   > (f_m*f^m*c_a*c^a+a_a*a^a*b_n*b^n)/(a_c*a^c*c_b*c^b)
</sxh>
----
''Together'' does not perform factorisation:
<sxh groovy; gutter: false>
println Together >> 'x**2/(x**2 - 1) + x/(x**2 - 1)'.t
</sxh>
<sxh plain; gutter: false>
   > (x**2-1)**(-1)*(x**2+x)
</sxh>
Use ''Together & Factor'':
<sxh groovy; gutter: false>
println( (Together & Factor) >> 'x**2/(x**2 - 1) + x/(x**2 - 1)'.t )
</sxh>
<sxh plain; gutter: false>
   > (-1+x)**(-1)*x
</sxh>

====See also====
  * Related guides: [[documentation:guide:applying_and_manipulating_transformations]], [[documentation:guide:list_of_transformations]]
  * Related transformations: [[documentation:ref:factor]], [[documentation:ref:expand]]
  * JavaDocs: [[http://api.redberry.cc/redberry/1.1.9/java-api/cc/redberry/core/transformations/fractions/TogetherTransformation.html| TogetherTransformation]]
  * Source code: [[https://bitbucket.org/redberry/redberry/src/tip/core/src/main/java/cc/redberry/core/fractions/TogetherTransformation.java|TogetherTransformation.java]]