### Related

##### noeval

(e^t * e^m, noeval);

Calculate

##### noeval-sum

i:2;

x:4;

noeval(sum("x^i",i,1,...

Calculate

? noeval;

Calculate

##### noeval

(e^t * e^m, noeval);

Calculate

##### noeval-sum

i:2;

x:4;

noeval(sum("x^i",i,1,...

Calculate

? noeval;

Calculate

### noeval

Run Example
```(%i1)load(itensor);
(%o1)         /usr/share/maxima/5.21.1/share/tensor/itensor.lisp
(%i2)  allsym:true;
(%o2)                                true
(%i3)  g([],[%4,%5])*g([],[%6,%7])*ichr2([%1,%4],[%3])*          ichr2([%2,%3],[u])*ichr2([%5,%6],[%1])*ichr2([%7,r],[%2])-          g([],[%4,%5])*g([],[%6,%7])*ichr2([%1,%2],[u])*          ichr2([%3,%5],[%1])*ichr2([%4,%6],[%3])*ichr2([%7,r],[%2]),noeval;
(%o3) g([], [%4, %5]) g([], [%6, %7]) ichr2([%1, %4], [%3])
ichr2([%2, %3], [u]) ichr2([%5, %6], [%1]) ichr2([%7, r], [%2])
- g([], [%4, %5]) g([], [%6, %7]) ichr2([%1, %2], [u]) ichr2([%3, %5], [%1])
ichr2([%4, %6], [%3]) ichr2([%7, r], [%2])
(%i4)  expr:ishow(%);
(%t4)             (%o4)              flipflag:true;
ishow(rename(expr));
(%o5)                                true
(%i6)  flipflag:false;
(%t6)             (%o6)             (%i7)  rename(%th(2));
(%o7)                                false
(%i8)  ishow(rename(expr));
(%o8)             (%i9) ```
Run Example
```? noeval;

-- Special symbol: noeval
`noeval' suppresses the evaluation phase of `ev'.  This is useful
in conjunction with other switches and in causing expressions to
be resimplified without being reevaluated.

(%o1)                                true
(%i2) ```
Run Example
```cos(п/4),noeval;
(%o1)                               cos(/4)
(%i2) ```

Help for Noeval