diff --git a/alga/src/general/real.rs b/alga/src/general/real.rs
index e76d28a..5e094ff 100644
--- a/alga/src/general/real.rs
+++ b/alga/src/general/real.rs
@@ -106,6 +106,8 @@ pub trait Real:
     fn ln_2() -> Self;
     fn ln_10() -> Self;
 
+    fn is_finite(&self) -> bool;
+
     /// Cardinal sine
     #[inline]
     fn sinc(self) -> Self {
@@ -429,6 +431,10 @@ macro_rules! impl_real(
             fn ln_10() -> Self {
                 $M::consts::LN_10
             }
+
+            fn is_finite(&self) -> bool {
+                $M::is_finite(*self)
+            }
         }
     )*)
 );